JP2020203867A - Tooth bleaching method and tooth bleaching device - Google Patents

Abstract

To provide a tooth bleaching method that can highly efficiently and safely whiten teeth without decalcifying the teeth, and a tooth bleaching device suitable for performing the method.SOLUTION: A tooth bleaching device includes: an external member having a waterproof cover material and a breathable/waterproof material; a bleach precursor (I) containing chlorite (salt) and an acidifying agent (II) containing a substance whose aqueous solution is acidic, which are present in a closed space inside the external member; and a member for preventing contact between the bleach precursor (I) and the acidifying agent (II). At least one of the bleach precursor (I) and the acidifying agent (II) is in the form of an aqueous liquid, or both are solid. In addition, an aqueous liquid exists in the closed space inside the external member in a form that does not come into contact with the bleach precursor (I) and the acidifying agent (II). In use of the device, it has a structure capable of preparing, in the closed space, the acidic aqueous liquid containing the bleach precursor (I) and the acidifying agent (II).SELECTED DRAWING: Figure 7

Description

The present invention relates to a tooth bleaching method using chlorous acid or a salt thereof, and a tooth bleaching device and kit suitable for carrying out the method.

Conventionally, oxygen-based bleaching agents such as hydrogen peroxide and urea peroxide have been used for tooth bleaching, that is, whitening. However, in order to obtain an effective effect in whitening using these oxygen-based bleaches, it is usually necessary to carry out the treatment for 8 to 10 minutes three times, that is, a total treatment time of about 30 minutes or more is required. Yes, it sometimes took several hours.

Patent Documents 1 and 2 disclose methods for bleaching teeth using sodium chlorite, which is permitted to be used as a food additive in Japan. According to Patent Document 1, sodium chlorite is brought into contact with an acidulant to generate chlorine dioxide, and the chlorine dioxide bleaches teeth. However, the method described in Patent Document 1 has a problem that decalcification of teeth is promoted because bleaching is performed in an acidic state.

FIG. 1 of Patent Document 2 shows that even if citric acid / sodium citrate buffer was added to sodium chlorite to lower the pH of the system, only a small amount of chlorine dioxide was produced. FIG. 3 shows that when anhydrous succinic acid and disodium chlorite were added instead of the citric acid / sodium citrate buffer solution, chlorine dioxide was produced and a bleaching effect was obtained. In the latter example, weakly basic (pH of 5% aqueous solution is 7.0 to 9.0) disodium succinate is added to sodium chlorite first, and then succinic anhydride is added immediately before use. There is.

Further, both Patent Documents 1 and 2 teach that sodium chlorite and an acidulant or an organic acid anhydride are kept physically separated from each other until immediately before use.

Patent Document 3 discloses a slow generation method of gaseous chlorine dioxide. The method is characterized in that an acid or ester vapor is brought into contact with a chlorite powder or a composition obtained by mixing or adsorbing an aqueous solution of chlorite or stabilized chlorine dioxide with a basic solid substance. And.

Patent Document 4 discloses a distribution package capable of simultaneously extruding different fluids from each of the two discharge openings.

Patent Document 5 describes a chlorine dioxide generation kit capable of generating chlorine dioxide by bringing chlorite and a water-soluble acidic substance into contact with each other in the presence of water at the time of use, and dioxide using such a kit. A method of generating chlorine is disclosed.

Non-Patent Document 1 discloses an example of a dual syringe.

Special table 2000-516221 Special table 2009-536935 JP-A-61-48404 JP 2016-159931 JP 2017-222528

TAB Laboratories, Inc. Homepage (http://dds.tab-labo.com/; January 29, 2019)

An object of the present invention is a tooth bleaching method that does not cause decalcification of teeth by utilizing a mechanism of generating chlorine dioxide in a gaseous state and absorbing and dissolving it in an aqueous liquid, and a tooth suitable for carrying out the method. To provide bleaching devices and kits.

While studying a method of tooth bleaching using gaseous chlorine dioxide, the present inventors have found that an aqueous liquid obtained by absorbing and dissolving gaseous chlorine dioxide in water exhibits almost neutrality. It was. Based on this finding, the present inventors have achieved the following inventions.

The tooth bleaching method (1) of the present invention is a step 1-1 of preparing an acidic aqueous liquid (a) of a bleaching agent precursor (I) containing chloric acid or a salt thereof to generate gaseous chlorine dioxide. , Obtained in steps 1-2 and 1-2 to obtain the aqueous liquid (c) containing chlorine dioxide by absorbing the generated gaseous chlorine dioxide into the aqueous liquid (b) containing no substance that reacts with chlorine dioxide. Steps 1-3 are included in which the aqueous liquid (c) containing chlorine dioxide is brought into contact with the teeth. The aqueous liquid (b) and the aqueous liquid (c) can be aqueous gels.

In the tooth bleaching method (2) of the present invention, an acidic aqueous liquid (a) of a bleaching agent precursor (I) containing chlorous acid or a salt thereof is prepared in step 2-1 of applying an aqueous gel to the teeth. , Step 2-2 for generating gaseous chlorine dioxide, and step 2-3 for allowing the aqueous gel applied to the teeth to absorb the gaseous chlorine dioxide generated in step 2-2.

These tooth bleaching methods according to the present invention can also be applied to tooth bleaching for cosmetic purposes.

The tooth bleaching device of the present invention is an external member provided with a waterproof cover material and a moisture-permeable / waterproof material, and a bleach precursor containing chlorous acid or a salt thereof existing in a closed space inside the external member. (I) and an acidifying agent (II) containing a substance whose aqueous solution is acidic, and a member for preventing contact between the bleaching agent precursor (I) and the acidifying agent (II) are provided. At least one of the bleach precursor (I) and the acidifying agent (II) is in the form of an aqueous liquid (d), or both the bleach precursor (I) and the acidifying agent (II). Is solid and does not come into contact with the bleach precursor (I) and the acidifying agent (II) in the closed space inside the external member, and the chloric acid, the chlorite, and the aqueous solution thereof are acidic. When an aqueous liquid (e) containing no substance that reacts with either the indicated substance or chlorine dioxide is present and the bleach precursor (I) is in the form of the aqueous liquid (d), the pH of the aqueous liquid (e) ( 25 ° C.) is 9 to 14, and has a structure capable of preparing an acidic aqueous liquid (a) containing a bleach precursor (I) and an acidifying agent (II) in a closed space when the device is used. In addition, "pH (25 ° C.)" means pH at 25 ° C., and the same applies to the following.

The tooth bleaching device of the present invention described above includes the following aspects (A) to (G):
(A) A waterproof cover material, an external member having a moisture-permeable / waterproof material connected to the end portion of the cover material and forming a closed space inside the cover material, and the inside of the external member. In the closed space of the above, an aqueous liquid (f) of the bleaching agent precursor (I) containing chlorous acid or a salt thereof and having a pH (25 ° C.) of 9 to 14 is accommodated therein. A waterproof first accommodating member, and a waterproof second accommodating member and a first accommodating member containing an aqueous liquid (g) of an acidifying agent (II) containing a substance whose aqueous solution is acidic. A damage member and a second storage member breakage member are provided, and the first storage member damage member and the second storage member damage member are present at positions where the first storage member and the second storage member can be damaged, respectively. A featured tooth bleaching device. In this embodiment, the first accommodating member and the second accommodating member correspond to the contact prevention member, and the bleach precursor (I) and the acidifying agent (II) are both in the form of an aqueous liquid. By damaging each of the first accommodating member and the second accommodating member by the first accommodating member breaking member and the second accommodating member breaking member, the two types of aqueous liquids (f) and (g) are mixed and the closed space is closed. An acidic aqueous liquid (a) containing the bleach precursor (I) and the acidifying agent (II) is prepared therein.

(B) A waterproof cover material, an external member having a moisture-permeable / waterproof material connected to the end portion of the cover material and forming a closed space inside the cover material, and the inside of the external member. In the closed space of the above, an aqueous liquid (f) of the bleaching agent precursor (I) containing chlorous acid or a salt thereof and having a pH (25 ° C.) of 9 to 14 is accommodated therein. The first accommodating member is provided with a waterproof first accommodating member, a solid acidifying agent (II') containing a substance whose aqueous solution is acidic, and a first accommodating member damaging member. A tooth bleaching device characterized by being in a position where the containment member can be damaged. In this aspect, the first containment member corresponds to a contact prevention member, and only the bleach precursor (I) is in the form of an aqueous liquid. By damaging the first accommodating member by the first accommodating member breaking member, the solid acidifying agent (II') is dissolved in the aqueous liquid (f) of the bleaching agent precursor (I) and bleached in the closed space. An acidic aqueous liquid (a) containing the agent precursor (I) and the acidifying agent (II) is prepared.

(C) A waterproof cover material, an external member having a moisture-permeable / waterproof material connected to the end portion of the cover material and forming a closed space inside the cover material, and the inside of the external member. A bleach precursor (I') containing a solid chlorite and an aqueous liquid (g) of an acidifying agent (II) containing a substance whose aqueous solution shows acidity are housed in the closed space of the above. A device for bleaching teeth, comprising a waterproof second accommodating member and a second accommodating member breaking member, wherein the second accommodating member breaking member is present at a position where the second accommodating member can be damaged. .. In this aspect, the second accommodating member corresponds to a contact prevention member, and only the acidifying agent (II) is in the form of an aqueous liquid. By damaging the second accommodating member by the second accommodating member breaking member, the solid bleach precursor (I') is dissolved in the aqueous liquid (g) of the acidifying agent (II) and bleached in the closed space. An acidic aqueous liquid (a) containing the agent precursor (I) and the acidifying agent (II) is prepared.

(D) A waterproof cover material, an external member having a moisture-permeable / waterproof material connected to the end portion of the cover material and forming a closed space inside the cover material, and the inside of the external member. A waterproof liquid (e) containing chlorite, chlorite, a substance whose aqueous solution shows acidity, or a substance that reacts with chlorine dioxide is contained in the closed space of the above. Third containment member, bleach precursor (I') containing solid chlorite, acidifying agent (II') containing a solid aqueous solution of which is acidic, bleach precursor (I') A member for preventing contact between the acidifying agent (II') and the acidifying agent (II') and a member for damaging the third accommodating member are provided, and the contact preventing member is water-soluble liquid (e) permeable or water-soluble, and the third A device for bleaching teeth, wherein the accommodating member breaking member exists at a position where the third accommodating member can be damaged. In this embodiment, the bleach precursor (I') and the acidifying agent (II') are both in solid form and are kept in contact with each other by the anti-contact member. However, since the contact prevention member is permeable to the aqueous liquid (e) or water-soluble, the third accommodating member is damaged by the third accommodating member, so that the third accommodating member is solidified into the aqueous liquid (e). Bleach precursor (I') and solid acidifying agent (II') are dissolved, and an acidic aqueous liquid (a) containing the bleach precursor (I) and the acidifying agent (II) in a closed space. Is prepared.

(E) The first chamber defined by the waterproof cover material (x) and the waterproof partition wall connected to the end portion of the cover material (x), the partition wall, and the cover material at the end portion of the partition wall. The image is made of a waterproof cover material (y) in which one end is connected to the end on the side where (x) does not exist, and a moisture-permeable / waterproof material connected to the other end of the cover material (y). A bleaching agent precursor (I) containing chlorous acid or a salt thereof is contained in one of the first chamber and the second chamber, and the aqueous solution thereof is contained in the other chamber. An acidifying agent (II) containing an acidic substance is contained, and at least one of the bleaching agent precursor (I) and the acidifying agent (II) is present in the form of an aqueous liquid (d) and is bleached. When the agent precursor (I) is in the form of an aqueous liquid (d), the pH (25 ° C.) of the aqueous liquid is 9 to 14, and the partition wall can be broken. .. In this aspect, the cover material (x), the outer peripheral portion of the waterproof partition wall (the portion connected to the end portion of the cover material (x) and the end portion of the cover material (y)), the cover material (y) and the moisture permeable. -The waterproof material is an external member. In this aspect, both the first chamber and the second chamber are closed spaces, and the partition wall constitutes a contact prevention member between the bleach precursor (I) and the acidifying agent (II). By folding the partition wall when using the device, the first chamber and the second chamber are communicated with each other, and an acidic aqueous liquid (a) containing a bleach precursor (I) and an acidifying agent (II) is contained in one closed space. ) Is prepared.

(F) The first chamber defined by the waterproof cover material (z) and the waterproof partition connected to the end of the cover material (z), the partition, and the end of the partition to cover. It has a second chamber defined by a breathable / waterproof material connected to the end on the side where the material (z) does not exist, and either the first chamber or the second chamber has chloric acid or a salt thereof. The bleach precursor (I) containing the bleach precursor (I) is contained, and the acidifying agent (II) containing a substance whose aqueous solution is acidic is contained, and the bleach precursor (I) and acidification are contained. When at least one of the agent (II) is present in the form of an aqueous liquid (d) and the bleach precursor (I) is in the form of an aqueous liquid (d), the pH (25 ° C) of the aqueous liquid is A tooth bleaching device according to 9 to 14, wherein the partition wall can be broken. In this aspect, the waterproof cover material (z), the outer peripheral portion of the waterproof partition wall (the portion connected to the end portion of the cover material (z) and the end portion of the moisture permeable / waterproof material) and the moisture permeable / waterproof The sex material is an external member. In this aspect, both the first chamber and the second chamber are closed spaces, and the partition wall constitutes a contact prevention member between the bleach precursor (I) and the acidifying agent (II). By folding the partition wall when using the device, the first chamber and the second chamber are communicated with each other, and an acidic aqueous liquid (a) containing a bleach precursor (I) and an acidifying agent (II) is contained in one closed space. ) Is prepared.

The tooth bleaching devices (E) and (F) have an embodiment in which the aqueous liquid is present in the first chamber, that is, the aqueous liquid (f) of the bleaching agent precursor (I) is present in the first chamber and the first chamber. An embodiment in which a solid acidifying agent (II') is present in the two chambers, an aqueous liquid (g) of the acidifying agent (II) is present in the first chamber, and a solid chlorite is present in the second chamber. In the embodiment in which the bleaching agent precursor (I') containing the above is present, the aqueous liquid (f) of the bleaching agent precursor (I) is present in the first chamber and the aqueous acidifying agent (II) is present in the second chamber. The mode in which the liquid (g) is present, and the aqueous liquid (g) of the acidifying agent (II) is present in the first chamber, and the aqueous liquid (f) of the bleach precursor (I) is present in the second chamber. Includes aspects that exist.

In the tooth bleaching devices (A) to (F), the "contact prevention member between the bleaching agent precursor (I) and the acidifying agent (II)" exists in the closed space inside the external member. In the tooth bleaching devices (E) and (F), except for the portion in the partition wall that constitutes the external member, "a member for preventing contact between the bleaching agent precursor (I) and the acidifying agent (II)". Is.

(G) The first chamber, which is formed by adhering the outer peripheral portion of the waterproof cover material (r) to one surface of the waterproof partition wall and a part thereof, and the waterproof partition wall. The first chamber and the second chamber are provided with a second chamber which is formed by adhering the outer peripheral portion of another waterproof cover material (s) to the other part on the same surface. A bleaching agent precursor (I) containing chloric acid or a salt thereof, which is adjacent to each of (r) and (s) via an adhesion site to a partition wall and is contained in either the first chamber or the second chamber. Aqueous liquid (f) of the acidifying agent (II) containing a substance whose pH (25 ° C.) is 9 to 14 and whose aqueous solution is acidic. (G) is housed, and the partition wall has a notch that opens on the side where the cover materials (r) and (s) do not exist, and the notch is covered with a liquid absorbing / retaining member. A moisture permeable / waterproof material is adhered to the side where the cover materials (r) and (s) of the partition wall do not exist, and the surface of the liquid absorbing / retaining member is covered with the moisture permeable / waterproof material. As a result, a third chamber for accommodating the liquid absorbing / retaining member is formed, and the first chamber and the second chamber each open when the partition wall is broken, and the bleaching agent precursor A tooth bleaching device having a structure in which the aqueous liquid (f) of (I) and the aqueous liquid (g) of the acidifying agent (II) are simultaneously released. In this aspect, the waterproof cover material (r), the waterproof cover material (s), the outer peripheral portion of the partition wall, and the moisture-permeable / waterproof material are external members. In this embodiment, the first chamber, the second chamber, and the third chamber are all closed spaces, and the cover materials (r) and (s) are adhered to the partition wall between the first chamber and the second chamber. The part corresponds to a contact prevention member. When using the device, openings are created in the first and second chambers as the partition wall is broken at the notch, and the aqueous liquid (f) of the bleach precursor (I) and the acidifying agent (II). ) Is simultaneously released, and they are mixed in the liquid absorbing / retaining member of the third chamber, and the acidic aqueous liquid containing the bleach precursor (I) and the acidifying agent (II) is contained. The liquid (a) is prepared.

The above-mentioned tooth bleaching devices (A) to (D) also include an embodiment in which a water-permeable substrate is provided inside the moisture-permeable / waterproof material, and the breaking member is formed on the water-permeable substrate. Tooth.

In the tooth bleaching devices (A) to (F), the bleaching agent precursor (I') containing solid chlorite or the solid acidifying agent (II') absorbs liquids such as sponge and filter paper. It may be held by a holding member.

The tooth bleaching devices (A) to (G) may further include a chlorine dioxide trap member on the outer surface of the moisture permeable / waterproof material. Further, a polymer film or sheet may be further provided on the outer surface of the chlorine dioxide trap member.

The above tooth bleaching devices that do not have a chlorine dioxide trap member are placed on the outer periphery of the outer surface of the moisture permeable / waterproof material and / or on the outside of the moisture permeable / waterproof material. The embodiment including a chlorine dioxide trap layer is included. The chlorine dioxide trap layer is a layer made of activated carbon such as an activated carbon cloth or an activated carbon sheet.

The above-mentioned tooth bleaching device provided with a chlorine dioxide trap member is on the surface of the chlorine dioxide trap member on the opposite side to the moisture permeable / waterproof material and on the outer peripheral portion thereof. , And / or includes an embodiment in which a chlorine dioxide trap layer is provided on the outside of the chlorine dioxide trap member.

The present invention also includes the following tooth bleaching methods (3) to (5) using any of the tooth bleaching devices of the present invention:
The step of causing the chlorine dioxide trap member to hold the aqueous liquid (b) containing no substance that reacts with chlorine dioxide in any of the above-mentioned devices for bleaching teeth of the present invention and including the chlorine dioxide trap member. 3-1. Step 3-A step of preparing an acidic aqueous liquid (a) of a bleaching agent precursor (I) containing chlorine acid or a salt thereof in the tooth bleaching device to generate gaseous chlorine dioxide. 2. Step 3 to move the generated gas chlorine dioxide to reach the aqueous liquid (b) held in the chlorine dioxide trap member 3-3, move to the aqueous liquid (b) held in the chlorine dioxide trap member Step 3-4 to obtain an aqueous liquid (c) containing chlorine dioxide by absorbing the gaseous chlorine dioxide, and step 3 to bring the aqueous liquid (c) containing chlorine dioxide obtained in step 3-4 into contact with the teeth. Tooth bleaching method, including -5 (3);

Step 4-1 of applying an aqueous gel to a tooth, inside any of the above-mentioned tooth bleaching devices of the present invention, an acidic aqueous liquid of a bleaching agent precursor (I) containing chloric acid or a salt thereof ( In step 4-2 of preparing a) and generating gaseous chlorine dioxide, step 4-3 of causing the generated gaseous chlorine dioxide to reach the aqueous gel applied to the teeth, and the aqueous gel applied to the teeth. A tooth bleaching method (4); and comprising steps 4-4 of absorbing the moving gaseous chlorine dioxide to obtain an aqueous gel containing chlorine dioxide.

The above-mentioned device for bleaching teeth of the present invention, which has a moisture permeable / waterproof material portion on the outermost side when the device is used (in other words, a device not provided with a chlorine dioxide trap member). A bleaching method, step 5-1 of holding an aqueous gel on the outer surface of a moisture permeable / waterproof material, a bleaching agent precursor (I) containing chloric acid or a salt thereof in the tooth bleaching device. ) In step 5-2 of preparing the acidic aqueous liquid (a) and generating gaseous chlorine dioxide, moving the generated gaseous chlorine dioxide to keep the aqueous solution on the outer surface of the moisture permeable / waterproof material. Step 5-3 to reach the gel, step 5-4 to obtain an aqueous gel containing chlorine dioxide by absorbing the chlorine dioxide of the moving gas into the aqueous gel held on the outer surface of the moisture permeable / waterproof material. A method for bleaching teeth (5), which comprises contacting the chlorine dioxide-containing aqueous gel obtained in step 5-4 with the teeth.

The acidic aqueous liquid (a) of the bleach precursor (I) containing chlorous acid or a salt thereof also contains the acidifying agent (II) contained in the device.

The tooth bleaching methods (3) to (5) can also be applied to tooth bleaching for cosmetic purposes.

The present invention also includes the following tooth bleaching kits (1) and (2) used in the preparation of the tooth bleaching device of the present invention:
A tooth bleaching kit (1) including a hollow container and a rotationally moving member screwed onto one end of the hollow container, wherein the outer member of the hollow container is cylindrical and hollow (that is, cylindrical). ) A waterproof cover material, a waterproof sealing material that closes one end of the cover material, and a moisture-permeable / waterproof material that closes the other end of the cover material, and seals inside the hollow container. It has a female threaded portion at the end on the side where the material exists, a waterproof partition wall between the female threaded portion and the other end, and the inside of the hollow container is divided into two chambers arranged in series by the partition wall. It is divided into two chambers, one of which contains a bleaching agent precursor (I) containing chloric acid or a salt thereof, and the other of which contains an acidifying agent (II) containing a substance whose aqueous solution is acidic for bleaching. When at least one of the agent precursor (I) and the acidifying agent (II) is in the form of an aqueous liquid (d) and the bleaching agent precursor (I) is in the form of an aqueous liquid (d), the aqueous liquid The pH (25 ° C.) is 9 to 14, and the rotary moving member has a male threaded portion, and the sealing material at one end of the hollow container is removed or a hole is formed in the male threaded portion, and the threaded portion is formed at one end of the hollow container. To tooth bleaching kit (1), which is configured so that the first chamber and the second chamber of the hollow container communicate with each other when the rotary moving member is advanced in the hollow container by inserting and screwing it into the female screw portion. ;as well as

A tooth bleaching kit (2) including a dual syringe made of a waterproof material and a chlorine dioxide generating / bleaching member bonded to one end of the dual syringe. The dual syringes are arranged in parallel. First and second streams that have been bleached, two pistons with gaskets at the ends, each inserted into the stream from one end of those streams, and a seal that closes the other end of those streams. A water-based liquid (f) of the bleach precursor (I) containing a material, the encapsulant is removable, and one of the first and second streams contains bleach or a salt thereof. There is an aqueous liquid (g) of the acidifying agent (II) containing a substance whose pH (25 ° C.) is 9 to 14, but the aqueous solution shows acidity, and the chlorine dioxide generating / bleaching member is , Hollow structure, one end of which is removable to the other end of the first and second streams of the dual syringe from which the sealing material has been removed, and the other end of the chlorine dioxide generation / bleaching member is transparent. A tooth bleaching kit (2) that is closed with a damp / waterproof material.

The tooth bleaching kits (1) and (2) also include an embodiment in which a chlorine dioxide trap member is provided on the outer surface of the moisture permeable / waterproof material. Further, a polymer film or sheet may be further provided on the outer surface of the chlorine dioxide trap member.

The present invention also includes the following tooth bleaching methods (6) to (8) using any of the tooth bleaching kits of the present invention:
A substance that reacts with chlorine dioxide is added to the chlorine dioxide trap member of the tooth bleaching device prepared by using the tooth bleaching kit (1) or (2) of the present invention provided with the chlorine dioxide trap member. Step 6-1 to retain the water-free liquid (b), an acidic water-based liquid (a) of the bleach precursor (I) containing chloric acid or a salt thereof is prepared in the tooth bleaching device. , Step 6-2 to generate gaseous chlorine dioxide, step 6-3 to move the generated gaseous chlorine dioxide to reach the aqueous liquid (b) held in the chlorine dioxide trap member, hold it in the chlorine dioxide trap member The aqueous liquid (b) was made to absorb the chlorine dioxide of the moving gas to obtain the aqueous liquid (c) containing chlorine dioxide, and the aqueous solution containing chlorine dioxide obtained in steps 6-4 and 6-4. A tooth bleaching method (6) comprising contacting the liquid (c) with the teeth 6-5;

Step 7-1 of applying an aqueous gel to teeth, a bleaching agent containing chloric acid or a salt thereof in a tooth bleaching device prepared using the tooth bleaching kit (1) or (2) of the present invention. Step 7-2 to prepare the acidic aqueous liquid (a) of the precursor (I) to generate gaseous chlorine dioxide, and step 7-3 to bring the generated gaseous chlorine dioxide to the aqueous gel applied to the teeth. A method for bleaching teeth (7), which comprises a step 7-4 of absorbing chlorine dioxide in a moving gas into an aqueous gel applied to the teeth to obtain an aqueous gel containing chlorine dioxide.

A tooth bleaching device prepared by using the tooth bleaching kit (1) or (2) of the present invention, which has a moisture permeable / waterproof material portion on the outermost side when the device is used (in other words, For example, a method of bleaching teeth using a chlorine dioxide trap member), in which the aqueous gel is held on the outer surface of the moisture permeable / waterproof material in step 8-1, in the tooth bleaching device. , Prepare an acidic aqueous liquid (a) of the bleach precursor (I) containing chloric acid or a salt thereof and generate gaseous chlorine dioxide in step 8-2, move the generated gaseous chlorine dioxide. Step 8-3 to reach the water-based gel held on the outer surface of the moisture-permeable / waterproof material, the chlorine dioxide of the transferred gas is transferred to the water-based gel held on the outer surface of the moisture-permeable / waterproof material. A tooth bleaching method (8), which comprises a step 8-4 of absorbing and obtaining an aqueous gel containing chlorine dioxide, and a step 7-5 of bringing the obtained aqueous gel containing chlorine dioxide into contact with the tooth.

The "acidic aqueous liquid (a) of the bleach precursor (I) containing chlorous acid or a salt thereof" contains the acidifying agent (II) contained in the device.

The tooth bleaching methods (6) to (8) can also be applied to tooth bleaching for cosmetic purposes.

Further, in the tooth bleaching method of the present invention, the steps are not always carried out in the above order, and the steps may be carried out in a different order within a reasonable range.

In the present invention, since tooth whitening is performed using a substantially neutral aqueous liquid obtained by absorbing and dissolving gaseous chlorine dioxide in an aqueous liquid, the teeth are not decalcified. Further, according to the present invention, tooth whitening can be performed with high efficiency, that is, in a short time. Furthermore, according to the present invention, a dramatically high tooth bleaching effect can be easily and surely obtained. According to the present invention, tooth bleaching can be performed at home or in an aesthetic salon.

FIG. 1A is a schematic front view of the device 1a which is an example of the tooth bleaching device (A) of the present invention, and FIG. 1B is a schematic cross section of the device 1a on the I-I line. It is a figure. FIG. 2A is a schematic front view of device 1b, which is another example of the tooth bleaching device (A) of the present invention, and FIG. 2B is a schematic view of device 1b on line II-II. It is a cross-sectional view. FIG. 3A is a schematic front view of the device 2 which is an example of the tooth bleaching device (B) of the present invention, and FIG. 3B is a schematic cross section of the device 2 on lines III-III. It is a figure. FIG. 4A is a schematic front view of the device 3 which is an example of the tooth bleaching device (D) of the present invention, and FIG. 4B is a schematic cross section of the device 3 on the IV-IV line. It is a figure. FIG. 5A is a schematic front view of the device 4 which is an example of the tooth bleaching device (E) of the present invention, and FIG. 5B is a schematic cross section of the device 4 in the VV line. It is a figure. FIG. 6A is a schematic front view of the device 5a which is an example of the tooth bleaching device (F) of the present invention, and FIG. 6B is a schematic cross section of the device 5a on the VI-VI line. It is a figure. FIG. 7 (a) is a schematic front view of the device 5b, which is another example of the tooth bleaching device (F) of the present invention, and FIG. 7 (b) is a schematic view of the device 5b on the VII-VII line. It is a cross-sectional view. FIG. 8 (a) is a schematic front view of the device 6 which is an example of the tooth bleaching device (G) of the present invention, and FIG. 8 (b) is a schematic cross section of the device 6 on the line VIII-VIII. FIG. 8 (c) is a schematic cross-sectional view taken along the line IX-IX of the device 6. FIG. 9 is a partially omitted schematic cross-sectional view of an example of the tooth bleaching device of the present invention having a chlorine dioxide trap layer. FIG. 10 is a schematic perspective view showing an example of a fixture 100 for a tooth bleaching device of the present invention. FIG. 11A is a schematic cross-sectional view of a hollow container 8a constituting an example of the tooth bleaching kit (1) of the present invention. FIG. 11B is a schematic cross-sectional view of the rotationally moving member 8b constituting an example of the tooth bleaching kit (1) of the present invention. FIG. 11C is a schematic cross-sectional view showing a state in which the rotary moving member 8b is attached to the hollow container 8a. FIG. 12A is a plan view of the dual syringe 9a constituting an example of the tooth bleaching kit (2) of the present invention. FIG. 12B is a plan view of the chlorine dioxide generating / bleaching member 9b constituting an example of the tooth bleaching kit (2) of the present invention. FIG. 12 (c) is a schematic cross-sectional view showing a state in which the sealing material is removed in the X-ray line of FIG. 12 (a). FIG. 13 is a schematic cross-sectional view of the tooth bleaching device used in Experimental Examples 2 and 3. FIG. 14 is a schematic cross-sectional view of the tooth bleaching device used in Experimental Examples 4 and 5.

First, the meanings of the terms used in the present specification and the claims will be described.

"Bleach precursor (I) containing chlorous acid or a salt thereof" contains chlorous acid or a salt thereof as an essential component, and may contain other optional components as long as the effects of the present invention are not impaired. Good. It is referred to as a "bleach precursor" because chlorous acid or a salt thereof is a precursor of chlorine dioxide, which is a bleaching agent. The bleach precursor (I) can take various forms such as an aqueous liquid such as an aqueous solution and a solid form such as a powder. When the form is limited to a solid one, it is referred to as "bleach precursor (I')".

The chlorous acid contained in the bleach precursor (I) is colorless and exists in the form of an aqueous solution. Examples of chlorite contained in the bleach precursors (I) and (I') include sodium chlorite (CAS: 7758-19-2), potassium chlorite, lithium chlorite and the like. Examples include water-soluble chlorite. The basic aqueous solution of chlorite (preferably having a pH (25 ° C.) of 9 or more) is relatively stable. The aqueous solution of sodium chlorite is colorless to pale yellow. Sodium chlorite includes anhydrous salts and trihydrates. Anhydrous salts are colorless crystalline powders that are easily soluble in water, and their aqueous solutions are basic and stable unless exposed to light. Therefore, it is particularly preferable to use solid (for example, powdery) sodium chlorite or a basic aqueous solution thereof as the bleaching agent precursor (I). Moreover, it is preferable to use solid sodium chlorite as the bleaching agent precursor (I').

The "acidifying agent (II) containing a substance whose aqueous solution exhibits acidity" contains "a substance whose aqueous solution exhibits acidity" as an essential component, and contains other optional components as long as the effects of the present invention are not impaired. May be. The acidifying agent (II) can take various forms such as an aqueous liquid such as an aqueous solution and a solid form such as powder. When the form is limited to a solid one, it is referred to as "acidifying agent (II')". The acidifying agent (II) is used to acidify the pH (25 ° C.) of the aqueous liquid of the bleach precursor (I).

The "substance whose aqueous solution exhibits acidity" contained in the acidifying agent (II) may be an inorganic acid or a salt thereof, or an organic acid or a salt thereof, and is not particularly limited. Examples of "substances whose aqueous solution is acidic" include formic acid, acetic acid, ascorbic acid, phosphoric acids, citric acid, sulfuric acid and hydrochloric acid, and salts thereof, such as alkali metal salts. From the viewpoint of reactivity, it is preferable to use at least one selected from the group consisting of phosphoric acid, citric acid and sulfuric acid. From the viewpoint of safety, phosphoric acid and citric acid are preferable. When a solid acidifying agent (II) is used, citric acid, condensed phosphoric acids, and salts thereof are preferable.

In the acidifying agent (II), when the "substance whose aqueous solution is acidic" is in the form of crystals or powder, it may be used as it is or as an aqueous liquid such as an aqueous solution.

The "acidic aqueous liquid (a) of the bleaching agent precursor (I) containing chlorous acid or a salt thereof" contains a chlorous acid or a salt thereof as an essential component, and usually contains a substance whose aqueous solution exhibits acidity. The solvent is water or an aqueous liquid, and it is acidic. Such an acidic aqueous liquid (a) includes not only an aqueous solution in which only essential components are dissolved in water, but also an aqueous liquid containing components other than essential components, for example, a physiological saline solution containing essential components. Aqueous buffer and aqueous suspensions are also included.

The "aqueous liquid (b)" is used to absorb gaseous chlorine dioxide. Therefore, it does not contain substances that react with chlorine dioxide. The aqueous liquid (b) may be water, an aqueous buffering agent solution, a saline solution, or water-acetone, or an aqueous gel thereof, or saliva. The aqueous liquid (b) is held in, for example, a chlorine dioxide trap member. When the aqueous liquid (b) is an aqueous gel, it may be applied to teeth to be bleached or a moisture-permeable / waterproof material.

An aqueous gel, which is a type of aqueous liquid (b), can be prepared using a gelling agent. Examples of gelling agents include thickening polysaccharides used as food additives, specifically carboxymethyl cellulose (cmc), cmc sodium salt, cmc calcium salt, xanthan gum, guar gum, gellan gum, etc. Examples include carrageenan, pectin, locust bean gum, curdran, agar, glucomannan and alginic acid.

“Aqueous liquid (c)” refers to a state in which the aqueous liquid (b) has absorbed gaseous chlorine dioxide. The pH of the aqueous liquid (c) is preferably 5.0 to 7.0, more preferably 5.5 to 7.0.

The "aqueous liquid (d)" is one of the forms exhibited by the bleach precursor (I) or the acidifying agent (II). The aqueous liquid (d) contains not only an aqueous solution in which only essential components (chlorous acid or a salt thereof, or a substance whose aqueous solution shows acidity) are dissolved in water, but also components other than essential components. Aqueous liquids, such as physiological saline solutions containing essential components, buffer aqueous solutions and aqueous suspensions are also included. When the aqueous liquid (d) is the aqueous liquid of the bleach precursor (I), its pH is 9 to 14, preferably 11 to 13.

The "aqueous liquid (e)" is used to dissolve and disperse the solid bleach precursor (I') and the solid acidifying agent (II') in the device of the present invention. The aqueous liquid (e) does not contain chlorous acid, chlorite, a substance whose aqueous solution shows acidity, or a substance that reacts with any of chlorine dioxide. Examples of the aqueous liquid (e) are water, an aqueous buffering agent solution and a saline solution. The aqueous liquid (e) is an aqueous liquid obtained by dissolving and dispersing a solid bleach precursor (I') and a solid acidifying agent (II') in the aqueous liquid (e), and exhibits an acidic pH. Must be able to do.

The "aqueous liquid (f)" is one of the forms shown by the bleach precursor (I), which contains chlorous acid or a salt thereof, and the solvent is water or an aqueous liquid. The aqueous liquid (f) includes not only an aqueous solution in which only essential components are dissolved in water, but also an aqueous solution containing components other than essential components, for example, a physiological saline solution containing essential components, an aqueous buffering agent solution, and an aqueous solution. Suspensions are also included. In order to prevent or reduce the decomposition of chlorous acid or a salt thereof during storage, the aqueous liquid (f) is basic, preferably pH 9 to 14, and more preferably pH 11 to 13.

The "aqueous liquid (g)" is one of the forms exhibited by the acidifying agent (II), in which the aqueous solution contains a substance exhibiting acidity and the solvent is water or an aqueous liquid. The aqueous liquid (g) includes not only an aqueous solution in which only essential components are dissolved in water, but also an aqueous solution containing components other than essential components, for example, a physiological saline solution containing essential components, an aqueous buffering agent solution, and an aqueous solution. Suspensions are also included.

In the present invention, the pH of the aqueous liquid (d) or (f) of the bleaching agent precursor (I) containing chlorous acid or a salt thereof is made acidic by adding the acidifying agent (II). In this way, an acidic aqueous liquid (a) of the bleach precursor (I) containing chlorous acid or a salt thereof is obtained, and gaseous chlorine dioxide is generated. The preferable pH of the "acidic aqueous liquid (a) of the bleaching agent precursor (I) containing chlorous acid or a salt thereof" is 1 to 4, and the more preferable pH is 1 to 3.

The acidic aqueous liquid (a) contains the bleach precursor (I) as an essential component, and usually also contains the acidifying agent (II). Other optional components may also be contained as long as the effects obtained by the present invention are not impaired. Examples of the optional component include platinum nanocolloid, titanium dioxide, chloroplatinic acid, cobalt oxide and the like. These components may be contained in the bleach precursor (I) of the tooth bleaching device of the present invention, may be contained in the acidifying agent (II), or are these. It may be provided separately.

The "external member" is a member that specifies the shape of the tooth bleaching device of the present invention, and includes a waterproof cover material and a moisture-permeable / waterproof material. The "waterproof cover material" that constitutes a part of the external member is, for example, a sheet made of a waterproof material (for example, a waterproof polymer such as polyethylene, polyurethane, and polytetrafluoroethylene) at least inside thereof. .. As the "waterproof cover material", a material having moisture resistance such as a polyethylene sheet or an aluminum vapor deposition sheet is preferable. Further, depending on the aspect of the tooth bleaching device of the present invention, the "waterproof cover material" may be made of waterproof hard plastic. The "moisture permeable / waterproof material" that constitutes the other part of the external member is made of a material that has holes large enough to allow water molecules to pass through but water vapor and gaseous chlorine dioxide to pass through. For example, a sheet. Examples are high-density polyethylene non-woven fabrics, polyethylene-based porous films, polyurethane-based porous films, and polytetrafluoroethylene porous films. As will be clear from the description of the embodiment of the tooth bleaching device of the present invention described later, the external member may consist only of a waterproof cover material and a moisture-permeable / waterproof material, and in addition to these, others. The part made of the material of the above may also form a part of the external member.

The "member for preventing contact between the bleaching agent precursor (I) and the acidifying agent (II)" is a substance in which chlorous acid or a salt thereof and an aqueous solution thereof are acidic when the tooth bleaching device of the present invention is stored. Is a member that can be isolated so that they do not come into contact with each other. Specifically, the first accommodating member and the second accommodating member in the tooth bleaching devices (A) to (C), the contact prevention member in the tooth bleaching device (D), and the tooth bleaching device (E). ) And (F). In the tooth bleaching device (G), the adhesion portions of the cover materials (r) and (s) existing between the first chamber and the second chamber to the partition wall are contact prevention members.

The first and second accommodating members in the tooth bleaching devices (A) to (C) are bags made of waterproof polymer sheets such as polyethylene, polyurethane, and polytetrafluoroethylene. The third housing member in the tooth bleaching device (D) is a bag made of a waterproof polymer sheet such as polyethylene, polyurethane, and polytetrafluoroethylene.

The contact prevention member in the tooth bleaching device (D) is a member made of a material capable of permeating an aqueous liquid or being water-soluble. Examples include woven fabrics and meshes with eyes sized to prevent solid bleach precursors (I') and solid acidifiers (II') from passing through, papers such as filter paper, and water-soluble polymer films. Can be mentioned. The partition wall in the tooth bleaching devices (E) to (G) is, for example, a plate made of a waterproof material (for example, plastic). The waterproof covering materials (r) and (s) in the tooth bleaching device (G) are waterproof polymer sheets such as polyethylene, polyurethane, and polytetrafluoroethylene.

The device of the present invention has a structure capable of preparing an acidic aqueous liquid (a) containing a bleach precursor (I) and an acidifying agent (II) in a closed space when used. A "closed space" is not a closed space. Gas can flow in and out of a closed space through a moisture-permeable / waterproof material, which is one of the components of the space. To prepare the aqueous liquid (a), the tooth bleaching devices (A)-(D) have a "breaking member" and the tooth bleaching devices (E)-(G) have a septum that can be broken. doing. A "breaking member" is one capable of damaging a first, second, or third accommodating member. An example is a member made of a hard material (eg, plastic) having a pointed shape. A "breakable bulkhead" is, for example, a plate made of a waterproof material (eg, plastic) with a notch.

The "water-permeable substrate" is a plate-shaped member having a hardness that can maintain its shape and allowing an aqueous liquid such as water to permeate or pass through. One example is a plastic plate with a large number of holes.

A bleach precursor (I') containing a solid chlorite, a solid acidifying agent (II'), or a "liquid absorbing / retaining member" that holds an aqueous liquid is a small void that it has. In addition, it is made of a material capable of holding a solid or an aqueous liquid, for example, sponge, filter paper, or woven cloth.

The "chlorine dioxide trap member" is made of a material capable of holding the aqueous liquids (b) and (c). In the present invention, gaseous chlorine dioxide is absorbed in the aqueous liquid (b) held by the chlorine dioxide trap member to become the aqueous liquid (c). Examples of chlorine dioxide trap members include filter papers, sponges, fine brushes, woven fabrics, and non-woven fabrics. Examples of the material include polyester, nylon, vinylon, polypropylene, rayon, low-density polyethylene, and ethylene-vinyl acetate copolymer. In the device of the present invention, the chlorine dioxide trap member is not limited to one, and two or more chlorine dioxide trap members of the same material or different materials may be present.

The "polymer film or sheet" that covers the surface of the chlorine dioxide trap member covers the surface of the chlorine dioxide trap member during storage of the tooth bleaching device of the present invention and is peeled off during its use. If the tooth bleaching device of the present invention is enclosed in an outer bag, the "polymer film or sheet" may not be present. Examples of raw material polymers for such films or sheets are low density polyethylene, high density polyethylene, polypropylene, polystyrene, polyvinyl acetate, polyurethane, polyester, acrylate polymers, methacrylate polymers and polyethylene terephthalate.

The "chlorine dioxide trap layer" is a layer for capturing gaseous chlorine dioxide that is not used for bleaching, in other words, gaseous chlorine dioxide that is not retained in the aqueous liquid (b) (for example, activated carbon such as an activated carbon cloth or an activated carbon sheet). Layer containing).

The "tooth bleaching kit" in the present invention is a tooth bleaching device of the present invention by combining the members constituting the kit. In the "tooth bleaching kit (1)", the "cylindrical and hollow waterproof cover material" constituting the hollow container is made of a waterproof and hard polymer such as polypropylene, polyethylene terephthalate, acrylate polymer, and methacrylate polymer. Is. The "waterproof encapsulant" is a material capable of isolating the bleach precursor (I) and the acidifying agent (II) existing inside the waterproof cover material from the outside, for example, polyethylene, polyurethane, and polytetrafluoro. A sheet, for example, made of a waterproof polymer such as ethylene. A "moisture permeable / waterproof material" is, for example, a sheet made of a material having holes having a size that allows water molecules to pass through but water vapor or gaseous chlorine dioxide to pass through. Examples are high-density polyethylene non-woven fabrics, polyethylene-based porous films, polyurethane-based porous films, and polytetrafluoroethylene porous films.

A female thread portion exists inside one end of the cylindrical and hollow waterproof cover material. The female thread portion is composed of, for example, a flexible rubber ring, more specifically, a silicone rubber ring, and a metal female thread that is closely inserted into the hole of the ring. Further, the partition wall existing inside the cylindrical and hollow waterproof cover material is made of a waterproof and hard polymer such as polypropylene, polyethylene terephthalate, acrylate polymer, and methacrylate polymer.

The rotary moving member exists inside the hollow waterproof cover material because its male threaded portion is screwed with the female threaded portion of the hollow container and travels inside the hollow waterproof cover material while rotating. It is possible to communicate the first room and the second room. Specifically, for example, a metal protrusion is present on the extension line of the male thread portion, and the protrusion allows a hole to be formed in the partition wall between the first chamber and the second chamber. ..

In the "Tooth Bleaching Kit (2)", the "dual syringe" syringe is made of a waterproof polymer, such as low density polyethylene or polypropylene. The gasket is made of, for example, butadiene rubber or thermoplastic elastomer, and the piston is made of, for example, polyethylene. In a "dual syringe", the encapsulant that closes one end of the stream (the end where the piston is not inserted) is threaded into, for example, a thread formed on the outside of the first and second streams. A plastic lid that fits or fits on the outside of the first and second streams.

The chlorine dioxide generating / bleaching member is, for example, a hollow and cylindrical member, and the material thereof is a waterproof polymer such as low-density polyethylene or polypropylene. One end thereof is screwed into a thread formed on the outside of the first and second streams of the dual syringe, or fitted on the outside of the first and second streams. The other end is closed with a moisture permeable / waterproof material such as a high-density polyethylene non-woven fabric, a polyethylene-based porous film, a polyurethane-based porous film, and a polytetrafluoroethylene porous film.

The "tooth bleaching kit" in the present invention may also have a chlorine dioxide trap member on the outer surface of the moisture permeable / waterproof material, and a polymer film or sheet on the outer surface of the chlorine dioxide trap member. May be provided.

A "fixing tool" is an instrument for supporting a tooth bleaching device of the present invention when using the device.

Next, the tooth bleaching method (1) of the present invention will be described. The tooth bleaching method (1) of the present invention includes the following three steps:
Step 1-1, in which an acidic aqueous liquid (a) of a bleaching agent precursor (I) containing chlorous acid or a salt thereof is prepared to generate gaseous chlorine dioxide.
Obtained in steps 1-2 and 1-2 to obtain the aqueous liquid (c) containing chlorine dioxide by absorbing the generated gaseous chlorine dioxide in the aqueous liquid (b) containing no substance that reacts with chlorine dioxide. Step 1-3 in which the aqueous liquid (c) containing chlorine dioxide is brought into contact with the teeth.

In step 1-1, the bleaching agent precursor (I) containing chlorous acid or a salt thereof is dissolved with an acidifying agent (II) containing a substance whose aqueous solution shows acidity, or the bleaching agent precursor. This is a step of dissolving (I) in the acidifying agent (II) to prepare an acidic aqueous liquid (a) of the bleaching agent precursor (I) and generating gaseous chlorine dioxide. The pH of the acidic aqueous liquid (a) is preferably 1 to 4, and more preferably 1 to 2. When this step is carried out by heating to 30 to 60 ° C., gaseous chlorine dioxide is generated more efficiently.

Step 1-2 is a step of absorbing the gaseous chlorine dioxide generated in step 1-1 into an aqueous liquid (b) containing no substance that reacts with chlorine dioxide to obtain an aqueous liquid (c) containing chlorine dioxide. is there. For example, the tooth bleaching device of the present invention described later is used to guide the generated gaseous chlorine dioxide to the aqueous liquid (b) and absorb it. Since the solubility of chlorine dioxide in water at 20 ° C. is 0.8 g / 100 mL, when the gaseous chlorine dioxide comes into contact with the aqueous liquid (b), the aqueous liquid (b) does not dissolve chlorine dioxide exceeding the solubility. As long as the gaseous chlorine dioxide is dissolved in the aqueous liquid (b) and absorbed.

Steps 1-3 are tooth bleaching steps. In step 1-3, the aqueous liquid (c) containing chlorine dioxide obtained in step 1-2 is brought into contact with the teeth. The time may be about 10 seconds to 60 minutes, usually 30 seconds to 30 minutes. After completing steps 1-3, rinse the teeth and mouth.

Further, the tooth bleaching method (2) of the present invention will be described. The tooth bleaching method (2) of the present invention includes the following three steps:
Step 2-1 of applying water-based gel to teeth,
Step 2-2, in which an acidic aqueous liquid (a) of the bleach precursor (I) containing chlorous acid or a salt thereof is prepared to generate gaseous chlorine dioxide, and an aqueous gel applied to teeth, a step. Step 2-3 for absorbing the gaseous chlorine dioxide generated in 2-2.

Step 2-1 is a step of applying an aqueous gel to the teeth. The aqueous gel is used to absorb and retain gaseous chlorine dioxide in subsequent steps 2-3. This aqueous gel corresponds to the aqueous liquid (b) in the tooth bleaching method (1) and is therefore free of substances that react with chlorine dioxide. Aqueous gels can be prepared using gelling agents. Examples of gelling agents include thickening polysaccharides used as food additives, specifically carboxymethyl cellulose (cmc), cmc sodium salt, cmc calcium salt, xanthan gum, guar gum, gellan gum, etc. Examples include carrageenan, pectin, locust bean gum, curdran, agar, glucomannan and alginic acid.

Step 2-2 is the same as step 1-1 of the tooth bleaching method (1) of the present invention.

Steps 2-3 are steps of absorbing the generated gaseous chlorine dioxide into the aqueous gel. The aqueous gel absorbs and retains the generated gaseous chlorine dioxide if the chlorine dioxide has not reached a saturated concentration. Since the aqueous gel is applied to the teeth in step 2-1 the teeth are bleached by the presence of chlorine dioxide in the aqueous gel in steps 2-3.

Next, with reference to the drawings, preferred embodiments of the tooth bleaching device of the present invention will be described in order.

[Tooth bleaching device (A)]
FIG. 1 shows an example of the tooth bleaching device (A) of the present invention. The tooth bleaching device 1a includes an external member 1000 provided with a waterproof cover material 110 and a moisture-permeable / waterproof material 120, and a waterproof first accommodating member 101 in a closed space SP inside the external member 1000. The waterproof second accommodating member 102, the first accommodating member breaking member 111, and the second accommodating member breaking member 112 are provided.

The moisture permeable / waterproof material 120 is connected to the end portion 115 of the cover material 110 at the end portion 125 thereof. The inside 10 of the first storage member 101 contains the aqueous liquid (f) of the bleach precursor (I), and the inside 11 of the second storage member 102 contains a substance whose aqueous solution exhibits acidity. Contains the aqueous liquid (g) of the acidifying agent (II). The first accommodating member breaking member 111 and the second accommodating member breaking member 112 are made of resin and have a sharp shape, and are present at positions where the first accommodating member and the second accommodating member can be damaged, respectively.

The tooth bleaching device 1a is stored in a state in which the figures shown in FIGS. 1 (a) and 1 (b) are rotated 180 degrees, that is, in a state where the moisture permeable / waterproof material 120 is at the top. .. At the time of use, by pushing the cover material 110 from above in the state shown in each of FIGS. 1A and 1B, the first accommodating member breaking member 111 and the second accommodating member breaking member 112 can be used. The first accommodating member 101 and the second accommodating member 102 are broken, respectively. As a result, the aqueous liquid (f) of the bleach precursor (I) and the aqueous liquid (g) of the acidifying agent (II) are mixed in the closed space SP to generate an acidic aqueous liquid (a), which is a gas. Chlorine dioxide is generated. The acidic aqueous liquid (a) stays in the closed space SP, and chlorine dioxide, which is a gas that cannot be completely dissolved in the acidic aqueous liquid (a), passes through the gas permeable holes in the moisture permeable / waterproof material 120. In other words, it travels in the air within the hole and moves out of the device.

The device 1a holds the aqueous gel on the outer surface of the moisture-permeable / waterproof material 120 and then presses the aqueous gel against the tooth to be bleached, or applies the aqueous gel to the tooth to be bleached. It is used by pressing the outer surface of the moisture-permeable / waterproof material 120 of the device 1a against the aqueous gel applied to the teeth. These aqueous gels absorb the gaseous chlorine dioxide that has come out of the device 1a through the gas permeable holes in the moisture permeable / waterproof material 120, and the resulting aqueous solution containing chlorine dioxide. The gel performs tooth whitening.

FIG. 2 shows another example of the tooth bleaching device (A) of the present invention. The tooth bleaching device 1b has a chlorine dioxide trap member 130 on the outer surface of the moisture permeable / waterproof material 120 and a chlorine dioxide trap member 130 on the outer surface in addition to the constituent requirements of the tooth bleaching device 1a. Has a polymer sheet 190.

The chlorine dioxide trap member 130 is adhered to the moisture permeable / waterproof material 120 by, for example, point bonding so as not to close the gas (moisture) permeable holes of the moisture permeable / waterproof material 120. This is because if all the holes of the moisture permeable / waterproof material 120 are closed, water vapor and gaseous chlorine dioxide cannot pass through.

The polymer sheet 190 is bonded to the surface of the chlorine dioxide trap member 130 with, for example, a weak adhesive force or adhesive force. The polymer sheet 190 is peeled off from the chlorine dioxide trap member 130 during use of the tooth bleaching device 1b. If the tooth bleaching device 1b is enclosed in, for example, an outer bag, the polymer sheet 190 may not be present.

The tooth bleaching device 1b is stored in a state in which the figures shown in FIGS. 2 (a) and 2 (b) are rotated 180 degrees, that is, the polymer sheet 190 is at the top. At the time of use, the polymer sheet 190 is peeled off, and the chlorine dioxide trap member 130 retains the aqueous liquid (b) by being wetted with water or the like or by saliva. By pushing the cover material 110 from above in the state shown in each of FIGS. 2A and 2B, the first accommodating member breaking member 111 and the second accommodating member breaking member 112 are first. Break the accommodating member 101 and the second accommodating member 102. As a result, the aqueous liquid (f) of the bleach precursor (I) and the aqueous liquid (g) of the acidifying agent (II) are mixed in the closed space SP to generate an acidic aqueous liquid (a), which is a gas. Chlorine dioxide is generated. The acidic aqueous liquid (a) stays in the closed space SP, and only the gas such as chlorine dioxide passes through the gas permeable hole in the moisture permeable / waterproof material 120, in other words, in the hole. It moves in the air and moves toward the aqueous liquid (b) held in the chlorine dioxide trap member 130.

The aqueous chlorine dioxide that has moved from the closed space SP is absorbed and dissolved in the aqueous liquid (b) held by the chlorine dioxide trap member 130 to become the aqueous liquid (c). Tooth bleaching (whitening) is performed by bringing the chlorine dioxide trap member 130 holding the aqueous liquid (c) into contact with the teeth.

[Tooth bleaching devices (B) and (C)]
FIG. 3 shows an example of the tooth bleaching device (B) of the present invention. The tooth bleaching device 2 includes an external member 2000 including a waterproof cover material 210 and a moisture permeable / waterproof material 220, a chlorine dioxide trap member 230 outside the moisture permeable / waterproof material 220, and an external member 2000. In the closed space SP inside, a waterproof first accommodating member 201, a first accommodating member breaking member 211, and an acidifying agent (II') containing a substance whose aqueous solution shows acidity are provided. The moisture permeable / waterproof material 220 is connected to the end portion 215 of the cover material 210 at the end portion 225 thereof. Also in this embodiment, the surface of the chlorine dioxide trap member 230 may be coated with a polymer sheet. Further, the device of the present invention also includes an embodiment in which the chlorine dioxide trap member 230 does not exist outside the moisture permeable / waterproof material 220.

The aqueous liquid (f) of the bleach precursor (I) is contained in the inside 10 of the first accommodating member 201. The first accommodating member breaking member 211 is made of resin and has a sharp shape, and exists at a position where the first accommodating member can be damaged. An acidifying agent (II'), which is a solid and contains a substance whose aqueous solution is acidic, is also contained in the closed space SP. The solid acidifying agent (II') is coated with a woven fabric or mesh having a size that the solid acidifying agent (II') cannot pass through, paper such as filter paper, or a film made of a water-soluble polymer. May be good.

The chlorine dioxide trap member 230 is adhered to the moisture permeable / waterproof material 220 by, for example, point bonding so as not to close the gas (moisture) permeable holes of the moisture permeable / waterproof material 220. This is because if all the holes of the moisture permeable / waterproof material 220 are closed, water vapor and gaseous chlorine dioxide cannot pass through.

The tooth bleaching device 2 is stored in a state in which the figures shown in FIGS. 3A and 3B are rotated 180 degrees, that is, a chlorine dioxide trap member 230 is at the top. During use, the chlorine dioxide trap member 230 retains the aqueous liquid (b) by being wetted with water or the like or by saliva. By pushing the cover material 210 from above in the states shown in FIGS. 3A and 3B, the first accommodating member 201 is broken by the first accommodating member breaking member 211. As a result, in the closed space SP, the acidifying agent (II') is dissolved in the aqueous liquid (f) of the bleach precursor (I) to generate an acidic aqueous liquid (a), and gaseous chlorine dioxide is generated. To do. The acidic aqueous liquid (a) stays in the closed space SP, and only the gas such as chlorine dioxide passes through the gas permeable hole in the moisture permeable / waterproof material 120, in other words, in the hole. It moves in the air and moves toward the aqueous liquid (b) held in the chlorine dioxide trap member 230.

The aqueous chlorine dioxide that has moved from the closed space SP is absorbed and dissolved in the aqueous liquid (b) held by the chlorine dioxide trap member 230, and becomes the aqueous liquid (c). Tooth bleaching (whitening) is performed by bringing the chlorine dioxide trap member 230 holding the aqueous liquid (c) into contact with the teeth.

The tooth bleaching device (C) of the present invention is not shown. In FIG. 3, the tooth bleaching device (C) has a second accommodating member in which the aqueous liquid (g) of the acidifying agent (II) is accommodating in the inside 11 instead of the first accommodating member 201. However, there is a bleach precursor (I') containing solid chlorite instead of the solid acidifying agent (II'), and the second containing member is damaged instead of the first containing member breaking member 211. There is a member for use. Other than these, it is the same as the tooth bleaching device (B) of the present invention.

[Tooth bleaching device (D)]
FIG. 4 shows an example of the tooth bleaching device (D) of the present invention. The tooth bleaching device 3 is an external member 3000 including a waterproof cover material 310 and a moisture permeable / waterproof material 320, a chlorine dioxide trap material 330 outside the moisture permeable / waterproof material 320, and an external member 3000. In the internal closed space SP, a waterproof third accommodating member 301, a bleach precursor (I') containing solid chlorite, and an acidifying agent containing a solid substance whose aqueous solution shows acidity ( II'), the contact prevention members 300A and 300B covering the bleach precursor (I') and the acidifying agent (II'), respectively, the water permeable substrate 340, and the third accommodating member damage member 311 are provided. The moisture permeable / waterproof material 320 is connected to the end portion 315 of the cover material 310 at the end portion 325 thereof. Also in this embodiment, the surface of the chlorine dioxide trap member 330 may be coated with a polymer sheet. Further, the device of the present invention also includes an embodiment in which the chlorine dioxide trap member 330 does not exist outside the moisture permeable / waterproof material 320.

The above-mentioned aqueous liquid (e) is contained in the inside 12 of the third accommodating member 301. The third accommodating member breaking member 311 is made of resin and has a sharp shape, and exists at a position where the third accommodating member 301 can be damaged. A bleach precursor (I') containing a solid chlorite and an acidifying agent (II') containing a solid substance whose aqueous solution shows acidity are also housed in the enclosed space SP. During storage of device 3, they are coated with water-soluble polymer sheets 300A and 300B, respectively, so that the bleach precursor (I') and the acidifying agent (II') do not come into contact with each other. FIG. 3 shows the water-soluble polymer sheets 300A and 300B covering the solid bleach precursor (I') and the solid acidifying agent (II'), respectively, as the contact prevention member, although they are solid. Only one of the bleach precursor (I') and the solid acidifying agent (II') may be coated with a water-soluble polymer sheet and the other may be uncoated. Further, the contact prevention member may be a bag made of a water-soluble polymer containing a solid bleach precursor (I') or a solid acidifying agent (II') therein. The contact prevention member may be a paper such as a woven fabric, a mesh, or a filter paper having a size that prevents the solid bleach precursor (I') and the solid acidifying agent (II') from passing through.

A water permeable substrate 340 is also present in the closed space SP. In the tooth bleaching device 3, since the water permeable substrate 340 is arranged inside the moisture permeable / waterproof material 320, the third accommodating member breaking member 311 is formed on the water permeable substrate 340. The water-permeable substrate 340 is not an essential component of the tooth bleaching device 3, but its presence ensures that when the cover material 310 is pressed, the force is reliably transmitted to the third accommodating member 301, and the third The accommodating member 301 is more easily damaged. The tooth bleaching devices (A) to (C) described above may also have a water-permeable substrate.

In the tooth bleaching device 3, the moisture permeable / waterproof material 320 exists on the outside of the water permeable substrate 340, and the chlorine dioxide trap member 330 exists on the outside thereof. The liquid can pass through the water permeable substrate 340, but cannot pass through the moisture permeable / waterproof material 320. The water-permeable substrate 340 and the moisture-permeable / waterproof material 320 are bonded or not bonded by, for example, point bonding so as not to block the water-permeable or water-permeable holes of the water-permeable substrate 340. Further, the moisture permeable / waterproof material 320 and the chlorine dioxide trap member 330 are moisture permeable / waterproof by, for example, point bonding so as not to close the gas (moisture) permeable holes of the moisture permeable / waterproof material 320. It is adhered to the material 320. This is because if all the holes of the moisture permeable / waterproof material 320 are closed, water vapor and gaseous chlorine dioxide cannot pass through.

The tooth bleaching device 3 is stored in a state in which the figures shown in FIGS. 4A and 4B are rotated 180 degrees, that is, a chlorine dioxide trap member 330 is at the top. During use, the chlorine dioxide trap member 330 retains the aqueous liquid (b) by being wetted with water or the like or by saliva. By pushing the cover material 310 from above in the states shown in FIGS. 4A and 4B, the third accommodating member 301 is broken by the third accommodating member breaking member 311. As a result, in the closed space SP, the water-soluble polymer sheets 300A and 300B, the solid bleach precursor (I'), and the solid are mixed with the aqueous liquid (e) such as water contained in the third storage member 301. The acidifying agent (II') dissolves, an acidic aqueous liquid (a) is generated, and gaseous chlorine dioxide is generated. The acidic aqueous liquid (a) stays in the closed space SP and in the water-permeable or water-permeable holes of the water-permeable substrate 340, and only the gas such as chlorine dioxide is gas-permeable in the moisture-permeable / waterproof material 320. Through the hole, in other words, it moves in the air in the hole and moves toward the aqueous liquid (b) held in the chlorine dioxide trap member 330.

The aqueous chlorine dioxide that has moved from the closed space SP is absorbed and dissolved in the aqueous liquid (b) held by the chlorine dioxide trap member 330, and becomes the aqueous liquid (c). Tooth bleaching (whitening) is performed by bringing the chlorine dioxide trap member 330 holding the aqueous liquid (c) into contact with the teeth.

[Tooth bleaching device (E)]
FIG. 5 shows an example of the tooth bleaching device (E) of the present invention. The tooth bleaching device 4 is defined by the first chamber 470 defined by the waterproof cover material 410A and the waterproof partition wall 460, the partition wall 460, the waterproof cover material 410B, and the moisture permeable / waterproof material 420. It is equipped with a second room 480. A chlorine dioxide trap member 430 is present on the outside of the moisture permeable / waterproof material 420. The first chamber 470 contains an aqueous liquid (g) of an acidifying agent (II) containing a substance whose aqueous solution is acidic, and the second chamber 480 is bleached containing a solid chlorite. The agent precursor (I') is contained. The partition wall 460 is formed with a notch 461 that is open to the second chamber 480 side so that the partition wall 460 can be easily folded when the tooth bleaching device 4 is used.

In the tooth bleaching device 4, the external member 4000 includes a waterproof cover material 410A, a waterproof cover material 410B, a moisture permeable / waterproof material 420, and an outer peripheral portion of the waterproof partition wall 460. The outer peripheral portion (that is, the end portion) 412A of the cover material 410A is adhered to the outer peripheral portion (that is, the end portion) 465a of one surface a of the partition wall 460, and the one end portion 412B of the cover material 410B is the partition wall. It is adhered to the outer peripheral portion (that is, the end portion) 465b of the other surface b of the 460, and the outer peripheral portion (that is, the end portion) of the moisture permeable / waterproof material 420 is attached to the other end portion 415B of the cover material 410B. 425 is glued. A chlorine dioxide trap member 430 is present on the outside of the moisture permeable / waterproof material 420. Also in this embodiment, the surface of the chlorine dioxide trap member 430 may be coated with a polymer sheet. Further, the device of the present invention also includes an embodiment in which the chlorine dioxide trap member 430 does not exist on the outside of the moisture permeable / waterproof material 420.

In the tooth bleaching device 4, the first chamber 470 contains the aqueous liquid (g) of the acidifying agent (II), and the second chamber 480 contains the solid bleach precursor (I'). However, what is housed in at least one of the first chamber 470 and the second chamber 480 may be in the form of an aqueous liquid. Further, the bleach precursor (I) and the acidifying agent (II) may be separately housed in the first chamber 470 and the second chamber 480.

When the tooth bleaching device 4 is used, the chlorine dioxide trap member 430 retains the aqueous liquid (b) by being wetted with water or the like or by saliva. In the state shown in FIGS. 5A and 5B, the partition wall 460 is folded at the notch 461 by pushing up the outer peripheral portion of the partition wall 460. As a result, the first chamber 470 and the second chamber 480 communicate with each other, and the aqueous liquid (g) of the acidifying agent (II) in the first chamber 470 is combined with the solid bleach precursor (I) in the second chamber 480. ') Dissolves, an acidic aqueous liquid (a) is generated, and gaseous chlorine dioxide is generated. The generated acidic aqueous liquid (a) stays in the communicating first chamber 470 and second chamber 480, and only the gas such as chlorine dioxide is a gas permeable hole in the moisture permeable / waterproof material 420. Through, in other words, in the pores, it travels in the air and towards the aqueous liquid (b) held in the chlorine dioxide trap member 430.

The gaseous chlorine dioxide that has moved from the first chamber 470 and the second chamber 480 that communicated with the aqueous liquid (b) held in the chlorine dioxide trap member 430 is absorbed and dissolved, and becomes the aqueous liquid (c). Tooth bleaching (whitening) is performed by bringing the chlorine dioxide trap member 430 holding the aqueous liquid (c) into contact with the teeth.

[Tooth bleaching device (F)]
FIG. 6 shows an example of the tooth bleaching device (F) of the present invention. The tooth bleaching device 5a includes a first chamber 570 defined by a waterproof cover material 510 and a waterproof partition wall 560, and a second chamber 580 defined by the partition wall 560 and a breathable / waterproof material 520. Be prepared. A chlorine dioxide trap member 530 is present on the outside of the moisture permeable / waterproof material 520. The first chamber 570 contains a bleach precursor (I') containing a solid chlorite, and the second chamber 580 contains an acidifying agent (II) containing a substance whose aqueous solution shows acidity. ) Is contained in the aqueous liquid (g). The partition wall 560 is formed with a notch 561 that is open on the second chamber 580 side so that the partition wall 560 can be easily folded when the tooth bleaching device 5a is used.

In the tooth bleaching device 5a, the external member 5000 includes a waterproof cover material 510, a moisture permeable / waterproof material 520, and an outer peripheral portion of a waterproof partition wall 560. The outer peripheral portion (that is, the end portion) 512 of the cover material 510 is adhered to the outer peripheral portion (that is, the end portion) 565a of one surface a of the partition wall 560, and the outer peripheral portion (that is, the end portion) of the moisture permeable / waterproof material 520 is adhered. , End) 522 is adhered to the outer periphery (ie, end) 565b of the other surface b of the bulkhead 560. A chlorine dioxide trap member 530 is present on the outside of the moisture permeable / waterproof material 520. Also in this embodiment, the surface of the chlorine dioxide trap member 530 may be coated with a polymer sheet. Further, the device of the present invention also includes an embodiment in which the chlorine dioxide trap member 530 does not exist outside the moisture permeable / waterproof material 520.

In the tooth bleaching device 5a, the first chamber 570 contains a solid bleach precursor (I'), and the second chamber 580 contains an aqueous liquid (g) of an acidifying agent (II). However, what is housed in at least one of the first chamber 570 and the second chamber 580 may be in the form of an aqueous liquid. Further, the bleach precursor (I) and the acidifying agent (II) may be separately housed in the first chamber 570 and the second chamber 580.

When using the tooth bleaching device 5a, the chlorine dioxide trap member 530 retains the aqueous liquid (b) by being wetted with water or the like or by saliva. In the state shown in FIGS. 6A and 6B, the partition wall 560 is folded at the notch 561 by pushing up the outer peripheral portion of the partition wall 560. As a result, the first chamber 570 and the second chamber 580 communicate with each other, and the aqueous liquid (g) of the acidifying agent (II) in the second chamber 580 is combined with the solid bleach precursor (I) in the first chamber 570. ') Dissolves, an acidic aqueous liquid (a) is generated, and gaseous chlorine dioxide is generated. The generated acidic aqueous liquid (a) stays in the communicating first chamber 570 and second chamber 580, and only the gas such as chlorine dioxide is a gas permeable hole in the moisture permeable / waterproof material 520. Through, in other words, in the pores, it travels in the air and towards the aqueous liquid (b) held in the chlorine dioxide trap member 530.

The gaseous chlorine dioxide that has moved from the first chamber 570 and the second chamber 580 is absorbed and dissolved in the aqueous liquid (b) held in the chlorine dioxide trap member 530 to become the aqueous liquid (c). Tooth bleaching (whitening) is performed by bringing the chlorine dioxide trap member 530 holding the aqueous liquid (c) into contact with the teeth.

FIG. 7 shows another example of the tooth bleaching device (F) of the present invention. The tooth bleaching device 5b includes a first chamber 570 defined by a waterproof cover material 510 and a waterproof partition wall 560, and a second chamber 580 defined by the partition wall 560 and a breathable / waterproof material 520. Be prepared. The partition wall 560 is formed with a notch 50 that opens on the side of the surface b so that the partition wall 560 can be easily folded when the tooth bleaching device 5b is used. A liquid absorbing / retaining member 30 is present in and around the portion of the second chamber 580 where the notch 50 of the partition wall 560 is present. A chlorine dioxide trap member 530 is present on the outside of the moisture permeable / waterproof material 520. The first chamber 570 contains the aqueous liquid (f) of the bleach precursor (I) containing chlorite, and the second chamber 580 contains a solid substance whose aqueous solution shows acidity. The acidifying agent (II') contained therein is held and contained in a liquid absorbing / retaining member (specifically, a sponge) 30.

In the tooth bleaching device 5b, the external member 5100 comprises a waterproof cover material 510, a moisture permeable / waterproof material 520, and an outer peripheral portion of the waterproof partition wall 560. The outer peripheral portion (that is, the end portion) 512 of the cover material 510 is adhered to the outer peripheral portion (that is, the end portion) 565a of one surface a of the partition wall 560, and the moisture permeable / waterproof material 520 absorbs liquid. It is adhered to the other surface b of the partition wall 560 except for a portion covering the holding member 30. The adhesive portion between the waterproof cover material 510 and the waterproof partition wall 560 is indicated by reference numeral 515. A chlorine dioxide trap member 530 is present on the outside of the moisture permeable / waterproof material 520. Also in this embodiment, the surface of the chlorine dioxide trap member 530 may be coated with a polymer sheet. Further, the device of the present invention also includes an embodiment in which the chlorine dioxide trap member 530 does not exist outside the moisture permeable / waterproof material 520.

When using the tooth bleaching device 5b, the chlorine dioxide trap member 530 retains the aqueous liquid (b) by being wetted with water or the like or by saliva. In the state shown in FIGS. 7A and 7B, the partition wall 560 is broken at the notch 50 by pushing up the left and right ends of the device 5b. As a result, the aqueous liquid (f) of the bleach precursor (I) in the first chamber 570 flows out through the opening formed at the notch 50 and is absorbed by the liquid absorbing / retaining member 30. .. The aqueous liquid (f) of the bleach precursor (I) absorbed by the liquid-absorbing / retaining member 30 contains the solid acidifying agent (II') retained in the liquid-absorbing / retaining member 30. It dissolves and an acidic aqueous liquid (a) is prepared. Gaseous chlorine dioxide is generated from the acidic aqueous liquid (a). The generated acidic aqueous liquid (a) stays in the liquid absorbing / retaining member 30, that is, in the second chamber 580, and only a gas such as chlorine dioxide covers the liquid absorbing / retaining member 30. Through the gas permeable hole in the moisture permeable / waterproof material 520, in other words, it moves in the air in the hole and toward the aqueous liquid (b) held in the chlorine dioxide trap member 530. And move.

The gaseous chlorine dioxide that has moved from the second chamber 580 is absorbed and dissolved in the aqueous liquid (b) held by the chlorine dioxide trap member 530, and becomes the aqueous liquid (c). Tooth bleaching (whitening) is performed by bringing the chlorine dioxide trap member 530 holding the aqueous liquid (c) into contact with the tooth at the place where the liquid absorbing / retaining member 30 exists.

[Tooth bleaching device (G)]
FIG. 8 shows an example of the tooth bleaching device (G) of the present invention. In the tooth bleaching device 6, the cover material 610 is adhered to one surface a of the waterproof partition wall 660 in a shape as shown as an adhesive portion 615 or 615'in FIG. 8A, for example. The first chamber 670A and the second chamber 670B formed by the above are provided. The cover material constituting the first chamber 670A is indicated by reference numeral r, and the cover material constituting the second chamber 670B is indicated by reference numeral s. The first chamber 670A contains the aqueous liquid (f) of the bleach precursor (I) containing chlorous acid or a salt thereof, and the second chamber 670B contains a substance whose aqueous solution shows acidity. Contains an aqueous liquid (g) of the acidifying agent (II). The other surface b of the partition wall 660 is provided with the partition wall 660 and the third chamber 670C defined by the moisture permeable / waterproof material 620. A chlorine dioxide trap member 630 is present on the outside of the moisture permeable / waterproof material 620. The partition wall 660 is formed with a notch 50 that opens on the other side b so that the partition wall 660 can be easily folded when the tooth bleaching device 6 is used. A liquid absorbing / retaining member 40 is present in the third chamber 670C at a location where the notch 50 of the partition wall 660 is present and around the notch 50.

In the tooth bleaching device 6, the external member 6000 includes a waterproof cover material 610, a moisture permeable / waterproof material 620, and an outer peripheral portion of a waterproof partition wall 560. When the partition wall 660 is broken at the notch 50, both the first chamber 670A and the second chamber 670B are opened and accommodated in the bonding portions 615 and 615'of the cover material 610 to the partition wall 660. It has a shape that allows the aqueous liquids (f) and (g) to be released at the same time. Also in this embodiment, the surface of the chlorine dioxide trap member 630 may be coated with a polymer sheet. Further, the device of the present invention also includes an embodiment in which the chlorine dioxide trap member 630 does not exist outside the moisture permeable / waterproof material 620.

When using the tooth bleaching device 6, the chlorine dioxide trap member 630 retains the aqueous liquid (b) by being wetted with water or the like or by saliva. By pushing up the left and right ends of the device 6 in the states shown in FIGS. 8A, 8B, and 8C, the partition wall 660 is broken at the notch 50. As a result, the aqueous liquid (f) of the bleach precursor (I) in the first chamber 670A and the aqueous liquid (g) of the acidifying agent (II) in the second chamber 670B were formed at the notches 50. It flows out through the opening and is absorbed by the liquid absorbing / retaining member 40. In the voids in the liquid absorbing / retaining member 40, the aqueous liquid (f) of the bleach precursor (I) and the aqueous liquid (g) of the acidifying agent (II) are mixed to form an acidic aqueous liquid (a). ) Is prepared. In the acidic aqueous liquid (a), gaseous chlorine dioxide is generated. The generated acidic aqueous liquid (a) stays in the liquid absorbing / retaining member 40, that is, in the third chamber 670C, and only the gaseous gas such as chlorine dioxide covers the liquid absorbing / retaining member 40. Through the gas permeable hole in the moisture permeable / waterproof material 620, in other words, it moves in the air in the hole and toward the aqueous liquid (b) held in the chlorine dioxide trap member 630. And move.

The gaseous chlorine dioxide that has moved from the third chamber 670C is absorbed and dissolved in the aqueous liquid (b) held by the chlorine dioxide trap member 630 to become the aqueous liquid (c). Tooth bleaching (whitening) is performed by bringing the chlorine dioxide trap member 630 holding the aqueous liquid (c) into contact with the tooth at the place where the liquid absorbing / retaining member 40 is present.

The tooth bleaching devices (A) to (G) of the present invention described above, wherein the device has a chlorine dioxide trap member, is further opposite to the side of the chlorine dioxide trap member facing the moisture permeable / waterproof material. A chlorine dioxide trap layer may be provided on the side surface, adjacent to the outer peripheral portion thereof, and / or outside the chlorine dioxide trap member.

FIG. 9 is a partially omitted schematic cross-sectional view showing an example of a tooth bleaching device of the present invention provided with a chlorine dioxide trap layer. In this figure, the inside of the closed space SP of the tooth bleaching devices (A) to (D) of the present invention is not shown. The tooth bleaching device 7 is provided with a chlorine dioxide trap layer 750A on the surface of the chlorine dioxide trap member 730 opposite to the moisture permeable / waterproof material 720 and adjacent to the outer peripheral portion thereof. The chlorine dioxide trap layer 750B is also provided on the outside of the chlorine dioxide trap member 730.

Although not shown, in the tooth bleaching device (E) and the tooth bleaching device (F) of the present invention, the example shown in FIG. 6 also has the same moisture permeability of the chlorine dioxide trap member. A chlorine dioxide trap layer may be provided on the surface opposite to the waterproof material, adjacent to the outer peripheral portion thereof, and / or outside the chlorine dioxide trap member.

The chlorine dioxide trap layer is made of, for example, a sheet containing activated carbon such as an activated carbon cloth or an activated carbon sheet, a woven cloth or a non-woven fabric. The chlorine dioxide trap layer is a gaseous chlorine dioxide emitted from the inside of the tooth bleaching device of the present invention through a moisture permeable / waterproof material, and is an extra substance, for example, an aqueous solution held in a chlorine dioxide trap member. It is a layer that captures chlorine dioxide in a gas that has not been absorbed by the liquid.

The chlorine dioxide trap layer 750A is prepared, for example, by attaching an activated carbon cloth on the outer peripheral portion of the circular chlorine dioxide trap member 730 on the surface opposite to the moisture permeable / waterproof material 720. .. Further, the chlorine dioxide trap layer 750B is prepared by wrapping an activated carbon cloth around the outer peripheral portion of the device.

The above-mentioned tooth bleaching devices (A) to (G) of the present invention, which do not have a chlorine dioxide trap member, can also be provided with a chlorine dioxide trap layer. For example, a chlorine dioxide trap layer is provided on the outer peripheral portion of the moisture permeable / waterproof material 120 in the device 1a shown in FIG. 1 on the outer surface and / or on the outside of the moisture permeable / waterproof material 120. May be good.

An example of a method for manufacturing a tooth bleaching device of the present invention is shown below.

[Manufacturing method of tooth bleaching device 1a according to FIG. 1]
The aqueous liquid (f) of the bleaching agent precursor (I) is put into the bag-shaped member, and the opening is closed to obtain the first accommodating member 101. The aqueous liquid (g) of the acidifying agent (II) is put into another bag-shaped member, and the opening is closed to obtain the second accommodating member 102. The first accommodating member 101 and the second accommodating member 102 are placed on the cover material 110 (below the cover material 110 in FIGS. 1A and 1B). The first accommodating member breaking member 111 and the second accommodating member breaking member 112 are coupled to a predetermined position of the moisture permeable / waterproof material 120. The opening of the cover material 110 is closed with a moisture-permeable / waterproof material 120 in which the first accommodating member breaking member 111 and the second accommodating member breaking member 112 are coupled. At this time, the side where the first accommodating member breaking member 111 and the second accommodating member breaking member 112 are present is set as the inside. The end portion 125 of the moisture permeable / waterproof material 120 is adhered to the end portion 115 of the cover material 110.

[Manufacturing method of tooth bleaching device 1b according to FIG. 2]
In manufacturing the tooth bleaching device 1b, a step of connecting the first accommodating member breaking member 111 and the second accommodating member breaking member 112 and the cover material 110 at a predetermined position of the moisture permeable / waterproof material 120. The step of closing the opening is performed as follows. Prepare a material in which the moisture-permeable / waterproof material 120 and the chlorine dioxide trap member 130 are point-bonded. The surface of the chlorine dioxide trap member 130 is covered with a polymer sheet 190. The first accommodating member breaking member 111 and the second accommodating member breaking member 112 are coupled to a predetermined position of the moisture permeable / waterproof material 120. The opening of the cover material 110 is bonded to the first accommodating member breaking member 111 and the second accommodating member breaking member 112, and the moisture permeable / waterproof material 120 and the chlorine dioxide trap member 130 are point-bonded. The surface of the chlorine dioxide trap member 130 is covered with a polymer sheet 190.

[Manufacturing method of tooth bleaching device 2 shown in FIG. 3]
Except for the following two points, the tooth bleaching device 1a is manufactured according to the manufacturing method. (1) Instead of the second accommodating member 102, a solid (for example, powdery) acidifying agent (II') is used as it is or stored in a bag made of a water-soluble polymer. (2) Instead of the moisture-permeable / waterproof material 120, prepare a material in which the moisture-permeable / waterproof material 220 and the chlorine dioxide trap member 230 are point-bonded, and place the moisture-permeable / waterproof material 220 at a predetermined position. Only the first accommodating member breaking member 211 is coupled. The opening of the cover material 210 is closed with a member 211 to which the first accommodating member is damaged and the moisture permeable / waterproof material 220 and the chlorine dioxide trap member 230 are point-bonded.

[Manufacturing method of tooth bleaching device 3 shown in FIG. 4]
The aqueous liquid (e) is put into the bag-shaped member, and the opening is closed to obtain the third accommodating member 301. The third accommodating member 301 is placed on the cover material 310 (inside, below the cover material 310 in FIG. 4B). Separately, a moisture-permeable / waterproof material 320 and a chlorine dioxide trap member 330 are point-bonded to each other. A moisture-permeable / waterproof material 320 bonded to the chlorine dioxide trap member 330 is adhered to one surface of the water-permeable substrate 340 so as not to block the water-permeable holes. A bleach precursor (I') and an acidifying agent (II') having a particle size larger than the diameter of the water-permeable holes of the water-permeable substrate 340 are placed on the water-permeable substrate 340, and the respective surfaces are made of a water-soluble polymer. Cover with sheets 300A and 300B. The end portions of the water-soluble polymer sheets 300A and 300B are adhered to the water-permeable substrate 340. The third accommodating member breaking member 311 is coupled to a predetermined position of the water permeable substrate 340. After that, the opening of the cover material 310 is closed according to the manufacturing method of the tooth bleaching device 2.

[Manufacturing method of the tooth bleaching device 4 shown in FIG. 5]
The cover material 410A contains the aqueous liquid (g) of the acidifying agent (II). A partition wall 460 having a notch portion 461 is placed on the aqueous liquid (g) of the acidifying agent (II), and the outer peripheral portion 412A of the cover material 410A is adhered to the outer peripheral portion 465a of the surface a of the partition wall 460. Separately, a moisture-permeable / waterproof material 420 and a chlorine dioxide trap member 430 are point-bonded to each other. One outer peripheral portion 415B of the cover material 410B is attached to the outer peripheral portion 425B of the surface of the moisture permeable / waterproof material 420 that does not face the chlorine dioxide trap member 430, and a space (later the second chamber 480) is provided inside. To prepare a tubular body having (becomes). A bleach precursor (I') containing a solid chlorite is placed on the moisture permeable / waterproof material 420. The other outer peripheral portion 412B of the cover material 410B is adhered to the outer peripheral portion 465b of the surface b of the partition wall 460 with the cover material 410A and the aqueous liquid (g) of the acidifying agent (II).

[Manufacturing method of tooth bleaching device 5a according to FIG. 6]
Prepare a moisture-permeable / waterproof material 520 and a chlorine dioxide trap member 530 that are point-bonded. The aqueous liquid (g) of the acidifying agent (II) is housed in the space above the moisture permeable / waterproof material 520 (later to become the second chamber 580). A partition wall 560 having a notch 561 is placed on the moisture permeable / waterproof material 520, and the outer peripheral portion 522 of the moisture permeable / waterproof material 520 and the outer peripheral portion 565b of the surface b of the partition wall 560 are adhered to each other. A bleach precursor (I') containing solid chlorite is placed on the partition wall 560. The bleach precursor (I') is covered with the cover material 510, and the outer peripheral portion 565 a of the surface a of the partition wall 560 and the outer peripheral portion 512 of the cover material 510 are adhered to each other.

[Manufacturing method of tooth bleaching device 5b according to FIG. 7]
Prepare a moisture-permeable / waterproof material 520 and a chlorine dioxide trap member 530 that are point-bonded. A sponge is allowed to absorb the aqueous liquid (g) of the acidifying agent (II) and dried to prepare a liquid absorbing / retaining member 30 holding the solid acidifying agent (II'). An adhesive is applied to the three sides of the outer peripheral portion of the partition wall 560, and a cover material 510 having the same shape and size as the partition wall 560 is attached. The bag-shaped portion (first chamber 570) prepared in this manner contains the aqueous liquid (f) of the bleaching agent precursor (I), and one open side is also closed by applying an adhesive. .. In FIG. 7A, the portion indicated by reference numeral 515 is the location where the applied adhesive is present. The liquid absorbing / retaining member 30 is placed on the surface b of the partition wall 560 (below the surface b in FIG. 6B) at the location where the notch 50 exists and its periphery. The moisture permeable / waterproof material 520 and the chlorine dioxide trap member 530 are point-bonded, and the side of the moisture permeable / waterproof material 520 faces the partition wall 560, and the liquid absorbing / retaining member 30 and the partition wall 560. Cover the surface b of. The moisture permeable / waterproof material 520 is adhered to the partition wall 560. At this time, the portion of the moisture permeable / waterproof material 520 that covers the liquid absorbing / retaining member 30 is not adhered.

[Manufacturing method of tooth bleaching device 6 according to FIG. 8]
Prepare a moisture-permeable / waterproof material 620 and a chlorine dioxide trap member 630 that are point-bonded. Adhesive is applied to the outer peripheral portion of the partition wall 660, the three sides excluding one long side, and the meandering portion indicated by reference numeral 615'in FIG. 8A near the center of the device 6. Then, a cover material 610 having the same shape and size as the partition wall 660 is attached. In each of the two bag-shaped portions (first chamber 670A and second chamber 670B) prepared in this manner, the aqueous liquid (f) of the bleach precursor (I) and the aqueous liquid of the acidifying agent (II) (G) is accommodated, and one side that is open is also closed by applying an adhesive. In FIG. 8A, the portions indicated by reference numerals 615 and 615'are the locations where the applied adhesive is present. The liquid absorbing / retaining member 40 is placed on the surface b of the partition wall 660 (below the surface b in FIG. 8B) at the location where the notch 50 exists and around the notch 50. The moisture permeable / waterproof material 620 and the chlorine dioxide trap member 630 are point-bonded, and the side of the moisture permeable / waterproof material 620 faces the partition wall 660 to make the liquid absorbing / retaining member 40 and the partition wall 660. Cover the surface b of. The moisture permeable / waterproof material 620 is adhered to the partition wall 660. At this time, the portion of the moisture permeable / waterproof material 620 that covers the liquid absorbing / retaining member 40 is not adhered.

Further, tooth bleaching methods (3) to (5) using the tooth bleaching devices (A) to (G) of the present invention will be described.

The tooth bleaching method (3) of the present invention using any of the tooth bleaching devices (A) to (G) of the present invention uses the tooth bleaching device of the present invention having a chlorine dioxide trap member. The tooth bleaching method (3) is a step 3-1 of causing a chlorine dioxide trap member to hold an aqueous liquid (b) containing no substance that reacts with chlorine dioxide. In the tooth bleaching device, chloric acid or Step 3-2, in which the acidic aqueous liquid (a) of the bleach precursor (I) containing the salt is prepared and the generated gaseous chlorine dioxide is generated, the generated gaseous chlorine dioxide is transferred to the chlorine dioxide trap member. Step 3-3 to reach the retained aqueous liquid (b), the aqueous liquid (b) held in the chlorine dioxide trap member absorbs the chlorine dioxide of the moving gas, and the aqueous liquid (c) containing chlorine dioxide is absorbed. 3-4, and 3-5, in which the aqueous liquid (c) containing chlorine dioxide obtained in step 3-4 is brought into contact with the teeth. Step 3-1 may be performed after step 3-2, for example, when the aqueous liquid (b) held in the chlorine dioxide trap member is saliva.

When the devices (A) to (D) are used, first, the chlorine dioxide trap member of the device holds the aqueous liquid (b) (step 3-1). When the device (A) is used, the first accommodating member and the second accommodating member are broken, and when the device (B) is used, the first accommodating member is broken, and the device (C) is used. In some cases, breaking the second containment member, and in the case of using the device (D), breaking the third containment member, the acidity of the bleach precursor (I), including chlorous acid or a salt thereof. The aqueous liquid (a) is prepared and gaseous chlorine dioxide is generated (step 3-2). The generated gaseous chlorine dioxide moves, for example, automatically or actively (step 3-3) in the pores or voids of the moisture permeable / waterproof material in the device, and is an aqueous liquid held in the chlorine dioxide trap member. An aqueous liquid (c) containing chlorine dioxide is prepared by being absorbed in (b) (step 3-4). By bringing the aqueous liquid (c) into contact with the teeth (step 3-5), tooth bleaching proceeds.

When the devices (E) to (G) are used, first, the chlorine dioxide trap member of the device holds the aqueous liquid (b) (step 3-1), and then the partition wall of the device is folded. By folding the partition wall, an acidic aqueous liquid (a) of the bleach precursor (I) containing chlorous acid or a salt thereof is prepared in the device, and gaseous chlorine dioxide is generated (step 3-2). The generated gaseous chlorine dioxide moves, for example, automatically or actively (step 3-3) in the pores or voids of the moisture permeable / waterproof material of the device, and is an aqueous liquid held in the chlorine dioxide trap member (step 3-3). An aqueous liquid (c) containing chlorine dioxide is prepared by being absorbed by b) (step 3-4). By bringing the aqueous liquid (c) into contact with the teeth (step 3-5), tooth bleaching proceeds.

The aqueous liquid (b) held in the chlorine dioxide trap member is preferably an aqueous gel. This is because the aqueous gel serves to bond the tooth to the bleaching device.

The tooth bleaching method (4) of the present invention using any of the tooth bleaching devices (A) to (G) of the present invention is a step 4-1 of applying an aqueous gel to the teeth, the tooth bleaching device. In step 4-2, the acidic aqueous liquid (a) of the bleach precursor (I) containing chloric acid or a salt thereof is prepared to generate gaseous chlorine dioxide, and the generated gaseous chlorine dioxide is generated. Includes step 4-3 to reach the aqueous gel applied to the teeth and step 4-4 to obtain the aqueous gel containing chlorine dioxide by absorbing the moving gaseous chlorine dioxide in the aqueous gel applied to the teeth. .. Step 4-1 may be performed after step 4-2.

When the devices (A) to (D) are used, first, an aqueous gel, which is a kind of the aqueous liquid (b), is applied to the teeth (step 4-1). When the device (A) is used, the first accommodating member and the second accommodating member are broken, and when the device (B) is used, the first accommodating member is broken to break the device (C). A bleach precursor (I) containing chlorous acid or a salt thereof by breaking the second containment member when used and by breaking the third containing member when using the device (D). ), The acidic aqueous liquid (a) is prepared and gaseous chlorine dioxide is generated (step 4-2). The generated gaseous chlorine dioxide moves, for example, automatically or actively through the pores or voids of the device's moisture permeable / waterproof material, exits the device and reaches the aqueous gel applied to the teeth ( Step 4-3). By pressing the chlorine dioxide trap member of the device against the aqueous gel applied to the tooth, the moving gaseous chlorine dioxide is absorbed by the aqueous gel applied to the tooth, and an aqueous gel containing chlorine dioxide is obtained ( Step 4-4). In step 4-4, at the same time, tooth bleaching proceeds by the action of chlorine dioxide absorbed in the aqueous gel. This aqueous gel containing chlorine dioxide is a kind of aqueous liquid (c).

When the devices (E) to (G) are used, first, an aqueous gel which is a kind of the aqueous liquid (b) is applied to the teeth (step 4-1), and then the partition wall of the device is folded. By breaking the partition wall, an acidic aqueous liquid (a) of the bleach precursor (I) containing chlorous acid or a salt thereof is prepared, and gaseous chlorine dioxide is generated (step 4-2). The generated gaseous chlorine dioxide moves, for example, automatically or actively through the pores or voids of the device's moisture permeable / waterproof material, exits the device and reaches the aqueous gel applied to the teeth ( Step 4-3). By pressing the chlorine dioxide trap member of the device against the aqueous gel applied to the tooth, the moving gaseous chlorine dioxide is absorbed by the aqueous gel applied to the tooth, and an aqueous gel containing chlorine dioxide is obtained ( Step 4-4). In step 4-4, at the same time, tooth bleaching proceeds by the action of chlorine dioxide absorbed in the aqueous gel. This aqueous gel containing chlorine dioxide is a kind of aqueous liquid (c).

In the tooth bleaching method (5) of the present invention using any of the tooth bleaching devices (A) to (G) of the present invention, the outermost surface of one surface of the device is composed of a moisture permeable / waterproof material. (In other words, one that does not have a chlorine dioxide trap member) is used. The tooth bleaching method (5) is a step 5-1 of holding an aqueous gel on the outer surface of a moisture-permeable / waterproof material of the tooth bleaching device, chlorine acid or its own in the tooth bleaching device. Step 5-2 of preparing the acidic aqueous liquid (a) of the bleach precursor (I) containing a salt and generating gaseous chlorine dioxide, moving the generated gaseous chlorine dioxide, a moisture permeable / waterproof material. Step 5-3 to reach the aqueous gel held on the outer surface of the water-permeable / waterproof material, the aqueous gel held on the outer surface of the moisture-permeable / waterproof material absorbs the chlorine dioxide of the moving gas to absorb chlorine dioxide. It comprises a step 5-4 of obtaining an aqueous gel containing, and a step 5-5 of contacting the obtained aqueous gel containing chlorine dioxide with a tooth.

When the devices (A) to (D) are used, first, an aqueous gel which is a kind of the aqueous liquid (b) is held on the outer surface of the moisture permeable / waterproof material (step 5-1). When the device (A) is used, the first accommodating member and the second accommodating member are broken, and when the device (B) is used, the first accommodating member is broken to break the device (C). A bleach precursor (I) containing chlorous acid or a salt thereof by breaking the second containment member when used and by breaking the third containing member when using the device (D). ), The acidic aqueous liquid (a) is prepared and gaseous chlorine dioxide is generated (step 5-2). The generated gaseous chlorine dioxide moves, for example, automatically or actively through the pores or voids of the moisture permeable / waterproof material of the device, exits the device, and onto the outer surface of the moisture permeable / waterproof material. Reach the retained aqueous gel (step 5-3). Chlorine dioxide, which is a moving gas, is absorbed by the aqueous gel held on the outer surface of the moisture-permeable / waterproof material, and an aqueous gel containing chlorine dioxide is obtained (step 5-4). By bringing an aqueous gel containing chlorine dioxide into contact with the teeth (step 5-5), tooth bleaching proceeds. This aqueous gel containing chlorine dioxide is a kind of aqueous liquid (c).

When the devices (E) to (G) are used, first, an aqueous gel, which is a kind of the aqueous liquid (b), is held on the outer surface of the moisture permeable / waterproof material (step 5-1). Then fold the partition of the device. By breaking the partition wall, an acidic aqueous liquid (a) of the bleach precursor (I) containing chlorous acid or a salt thereof is prepared, and gaseous chlorine dioxide is generated (step 5-2). The generated gaseous chlorine dioxide moves, for example, automatically or actively through the pores or voids of the moisture permeable / waterproof material of the device, exits the device, and onto the outer surface of the moisture permeable / waterproof material. Reach the retained aqueous gel (step 5-3). Chlorine dioxide, which is a moving gas, is absorbed by the aqueous gel held on the outer surface of the moisture-permeable / waterproof material, and an aqueous gel containing chlorine dioxide is obtained (step 5-4). By bringing an aqueous gel containing chlorine dioxide into contact with the teeth (step 5-5), tooth bleaching proceeds. This aqueous gel containing chlorine dioxide is a kind of aqueous liquid (c).

Next, the fixture for the tooth bleaching device of the present invention will be described.

FIG. 10 is a schematic perspective view showing an example of a fixture of the device used when bleaching using the tooth bleaching device of the present invention. The fixture 100 has a support portion X of a tooth bleaching device and a grip portion Y. The surface of the cover material of the tooth bleaching device is pressed against the support portion X. For fixing the tooth bleaching device to the support portion X, for example, a double-sided adhesive tape may be used. Alternatively, the tooth bleaching device may be adsorbed and fixed by forming a plurality of small holes in the support portion X and sucking gas toward the inside of the grip portion Y through the small holes.

The covering material of the tooth bleaching device is waterproof, but it exhibits some breathability depending on the type of polymer of the material. Therefore, a plurality of small holes may be formed in the support portion X, an exhaust port may be provided in the grip portion Y, and an exhaust mechanism may be constructed in the grip portion Y. With such a structure, excess gaseous chlorine dioxide can be discharged from the cover material side of the tooth bleaching device.

Furthermore, a tooth bleaching kit capable of preparing the tooth bleaching device of the present invention will be described.

FIG. 11 is an example of a kit for preparing a tooth bleaching device of the present invention. This kit (1) is screwed into the hollow container 8a shown in FIG. 11A and the end portion (the side where the sealing material 840 is present) of the hollow container 8a shown in FIG. 11B. The rotary moving member 8b is included. FIG. 11C shows a state in which the rotary moving member 8b is screwed into the hollow container 8a.

The outer member of the hollow container 8a is a cylindrical and hollow waterproof cover material 810, a waterproof sealing material 840 that closes one end 815 of the cover material 810, and a transparent that closes the other end 812 of the cover material 810. It is provided with a wet / waterproof material 820. The cover material 810 is made of, for example, hard plastic. Inside one end of the hollow container 8a on the 815 side, for example, a ring 881 made of flexible rubber, more specifically made of silicone rubber, and a metal ring 881 densely inserted into the hole of the ring 881. There is a female thread member 880 composed of a female thread 883. A waterproof partition wall 860 exists in the hollow container 8a, and the inside of the hollow container 8a is defined by the partition wall 860 and is divided into two chambers 870A and 870B arranged in series. One of these two chambers (870A) contains the aqueous liquid (f) of the bleach precursor (I), and the other (870B) contains the solid acidifying agent (II'). A chlorine dioxide trap member may be present on the outside of the moisture-permeable / waterproof material 820, and a polymer film or sheet may be present on the outside thereof.

The rotary moving member 8b has an operation portion 855, a male screw portion 850, and a piercing portion 853. The rotary moving member 8b is made of metal, for example. The male thread portion 850 meshes with the female thread 883 of the female thread member 880 fixed inside the hollow container 8a. The piercing portion 853 protrudes at the center of the tip of the male thread portion 850.

At the time of use, the waterproof sealing material 840 is removed from the hollow container 8a, and while the rotary moving member 8b is rotated, the male thread portion 850 is engaged with the female thread 883 of the female thread member 880 to bleach the tooth. It becomes 8. In the tooth bleaching device 8, when the operation unit 855 is rotated, the rotary moving member 8b moves in the hollow container 8a in the axial direction. The piercing portion 853 is moved by the movement amount S1 to make a hole in the partition wall 860 or destroy the partition wall 860. As a result, the two chambers 870A and 870B communicate with each other, the solid acidifying agent (II') is dissolved in the aqueous liquid (f) of the bleaching agent precursor (I), and the acidic agent containing the bleaching agent precursor (I) is contained. An aqueous liquid (a) is produced. The gaseous chlorine dioxide is generated from the aqueous liquid (a). The generated acidic aqueous liquid (a) stays in the two chambers 870A and 870B that communicate with each other, and only the gaseous gas such as chlorine dioxide passes through the gas permeable pores in the moisture permeable / waterproof material 820. In other words, it moves in the air in the hole and moves to the outside.

A water-based gel is applied to the tooth to be bleached, and the moisture-permeable / waterproof material 820 of the tooth bleaching device 8 is pressed against the water-based gel, or the water-based gel is applied on the outer surface of the moisture-permeable / waterproof material 820. When the gel is held and the aqueous gel is pressed against the teeth, the gaseous chlorine dioxide that comes out from the inside of the tooth bleaching device 8 through the gas permeable holes in the moisture permeable / waterproof material 820 is the aqueous gel. It is absorbed and dissolved in, and becomes an aqueous gel which is a kind of aqueous liquid (c). Chlorine dioxide in this aqueous gel bleaches the teeth. When the device for bleaching teeth is provided with a chlorine dioxide trap member on the outer surface of a moisture permeable / waterproof material, the chlorine dioxide trap member is water-based by being wetted with water or the like or with saliva. It holds the liquid (b), and the aqueous liquid (b) absorbs the gaseous chlorine dioxide that comes out from inside the tooth bleaching device through the gas permeable holes in the moisture permeable / waterproof material. It dissolves and becomes an aqueous liquid (c). By pressing the chlorine dioxide trap member against the tooth, the tooth is bleached by the chlorine dioxide in the aqueous liquid (c).

FIG. 12 is another example of the kit for preparing a tooth bleaching device of the present invention. This kit (2) includes a dual syringe 9a made of a waterproof material shown in FIG. 12 (a) and a chlorine dioxide generating / bleaching member 9b bonded to the end of the dual syringe shown in FIG. 12 (b). And include.

The dual syringe 9a includes first and second streams 970A and 970B arranged in parallel, and two pistons 991A and 991B, each of which is inserted into the stream from one end 915A and 915B of those streams. It includes an operating portion 950 of the piston and a sealing material 960 that closes the other ends 912A and 912B of the streams 970A and 970B. The pistons 991A and 991B have gaskets 981A and 981B at their tips. The sealing material 960 is removable by a screwing mechanism. A cross-sectional view taken along line XX of the dual syringe 9a with the encapsulant 960 removed is shown in FIG. 12 (c). The first stream 970A contains the aqueous liquid (f) of the bleach precursor (I), and the second stream 970B contains the aqueous liquid (g) of the acidifying agent (II).

The chlorine dioxide generation / bleaching member 9b has a hollow structure, and one end 917 thereof is closed with a moisture permeable / waterproof material 920. The other end 918 is an open end. The chlorine dioxide generating / bleaching member 9b removes the encapsulant 960 from the dual syringe 9a and is coupled in its place. A chlorine dioxide trap member may be present on the outside of the moisture-permeable / waterproof material 920, and a polymer film or sheet may be present on the outside thereof.

When using this device, the sealing material 960 is removed and a chlorine dioxide generating / bleaching member 9b is attached to obtain a tooth bleaching device 9. By pushing the operation unit 950 of the pistons 991A and 991B, the aqueous liquid (f) of the bleach precursor (I) and the aqueous liquid (g) of the acidifying agent (II) are transferred to the inside 970C of the chlorine dioxide generating / bleaching member 9b. Guide. As a result, in the internal 970C of the chlorine dioxide generating / bleaching member 9b, the aqueous liquid (f) of the bleaching agent precursor (I) and the aqueous liquid (g) of the acidifying agent (II) are mixed, and the bleaching agent precursor is mixed. An acidic aqueous liquid (a) containing (I) is produced. The gaseous chlorine dioxide is generated from the aqueous liquid (a). The generated acidic aqueous liquid (a) stays in the inside 970C of the chlorine dioxide generating / bleaching member 9b, and only the gas such as chlorine dioxide gas has a gas permeable hole in the moisture permeable / waterproof material 920. Through, in other words, it moves in the air in the hole and moves outward.

A water-based gel is applied to the tooth to be bleached, and the moisture-permeable / waterproof material 920 of the tooth bleaching device 9 is pressed against the tooth, or the water-based gel is held on the outer surface of the moisture-permeable / waterproof material 920. When the aqueous gel was pressed against the tooth, it came out from the inside 970C of the chlorine dioxide generation / bleaching member 9b of the tooth bleaching device 9 through the gas permeable hole in the moisture permeable / waterproof material 920. The gaseous chlorine dioxide is absorbed by the aqueous gel and dissolved to form an aqueous gel, which is a type of aqueous liquid (c). Chlorine dioxide in this aqueous gel bleaches the teeth. When the device for bleaching teeth is provided with a chlorine dioxide trap member on the outer surface of a moisture permeable / waterproof material, the chlorine dioxide trap member is water-based by being wetted with water or the like or with saliva. It holds the liquid (b), and the aqueous liquid (b) absorbs the gaseous chlorine dioxide that comes out from inside the tooth bleaching device through the gas permeable holes in the moisture permeable / waterproof material. It dissolves and becomes an aqueous liquid (c). By pressing the chlorine dioxide trap member against the tooth, the tooth is bleached by the chlorine dioxide in the aqueous liquid (c).

An example of a method for manufacturing a tooth bleaching device preparation kit of the present invention is shown below.

[Manufacturing method of the hollow container 8a and the rotary moving member 8b of the kit shown in FIG. 11]
(Manufacturing method of hollow container 8a)
One end 812 of the hollow, cylindrical waterproof cover material 810 is sealed with the moisture permeable / waterproof material 820. The waterproof cover material 810 is erected so that the moisture permeable / waterproof material 820 is at the bottom, a solid acidifying agent (II') is inserted, and then the waterproof partition wall 860 is densely inserted to form the second chamber. Form 870B. At the other end 815 of the waterproof cover material 810, a female thread member 880 composed of a rubber ring 881 and a metal female thread 883 closely inserted in the hole of the ring 881 is inserted. The aqueous liquid (f) of the bleach precursor (I) is injected into the first chamber 870A, and the other end 815 is sealed with the sealing material 840.

(Manufacturing method of rotary moving member 8b)
The rotationally moving member 8b is manufactured by a known method, for example, by carving out a piercing portion 853 at one end of a metal rod-shaped body, forming a male screw portion 850, and connecting the operating portion 855. ..

[Manufacturing method of dual syringe 9a and chlorine dioxide generating / bleaching member 9b of the kit shown in FIG. 12]
(Manufacturing method of dual syringe 9a)
A dual syringe (commercially available) having the structure shown in FIG. 12A is prepared, and the sealing material 960 is removed. The aqueous liquid (f) of the bleach precursor (I) is sucked into the first stream 970A, and the aqueous liquid (g) of the acidifying agent (II) is sucked into the second stream 970B. Seal with bleach 960 to produce dual syringe 9a.

(Manufacturing method of chlorine dioxide generation / bleaching member 9b)
A hollow, cylindrical waterproof cover material 910 that is screwed into the dual syringe 9a from which the sealing material 960 has been removed is prepared. One end 917 is sealed with a breathable / waterproof material 920.

Further, tooth bleaching methods (6) to (8) using the kits (1) and (2) for preparing a tooth bleaching device of the present invention will be described.

The tooth bleaching method (6) of the present invention is a tooth bleaching device prepared by using the tooth bleaching device preparation kit (1) or (2) of the present invention, and is breathable and waterproof. Use a material having a chlorine dioxide trap member on the outside of the material. The tooth bleaching method (6) reacts with chlorine dioxide in the chlorine dioxide trap member of the tooth bleaching device prepared by using the kit (1) or (2) for preparing the tooth bleaching device of the present invention. Step 6-1 to retain the substance-free aqueous liquid (b), in the tooth bleaching device, the acidic aqueous liquid (a) of the bleach precursor (I) containing chloric acid or a salt thereof. Step 6-2 to prepare and generate gaseous chlorine dioxide, step 6-3 to move the generated gaseous chlorine dioxide to reach the aqueous liquid (b) held in the chlorine dioxide trap member, step 6-3, chlorine dioxide trap member. The aqueous liquid (b) held in the water absorbs the chlorine dioxide of the moving gas to obtain the aqueous liquid (c) containing chlorine dioxide, and the chlorine dioxide obtained in steps 6-4 and 6-4 is used. It comprises steps 6-5 of bringing the containing aqueous liquid (c) into contact with the teeth. Step 6-1 may be performed after step 6-2, for example, when the aqueous liquid (b) held in the chlorine dioxide trap member is saliva.

Specifically, the method of using the kit (1) shown in FIG. 11 having a chlorine dioxide trap member on the outside of the moisture permeable / waterproof material 820 is as follows. First, the chlorine dioxide trap member (not shown) existing at the end of the hollow container 8a holds the aqueous liquid (b) containing no substance that reacts with chlorine dioxide (step 6-1). The screw portion 850 of the rotary moving member 8b is screwed into the hollow container 8a. The rotary moving member 8b is rotated by holding the operation unit 855 so that the piercing portion 853 reaches the partition wall 860, and the partition wall 860 is removed or a hole is made in the partition wall 860. As a result, the first chamber 870A and the second chamber 870B communicate with each other, and the solid acidifying agent (II') is dissolved in the aqueous liquid (f) of the bleaching agent precursor (I), and the bleaching agent precursor (I) is dissolved. ), The acidic aqueous liquid (a) is prepared to generate gaseous chlorine dioxide (step 6-2). The generated gaseous chlorine dioxide moves, for example, automatically or actively in the pores or voids of the moisture permeable / waterproof material 820, exits the device, and is retained in the chlorine dioxide trap member. b) is reached (step 6-3). The moving gas chlorine dioxide is absorbed and dissolved in the aqueous liquid (b) held in the chlorine dioxide trap member, and the aqueous liquid (c) containing chlorine dioxide is obtained (step 6-4). By bringing the aqueous liquid (c) containing chlorine dioxide obtained in step 6-4 into contact with the teeth (step 6-5), tooth bleaching proceeds.

The method of using the kit (2) shown in FIG. 12 having a chlorine dioxide trap member (not shown) on the outside of the moisture permeable / waterproof material 920 is specifically as follows. First, a chlorine dioxide trap member (not shown) existing at the end of the chlorine dioxide generating / bleaching member 9b holds an aqueous liquid (b) containing no substance that reacts with chlorine dioxide (step 6-1). .. The sealing material 960 is removed from the dual syringe 9a, and a chlorine dioxide generating / bleaching member 9b is attached instead. The operation unit 950 is pushed into the aqueous liquid (f) of the bleach precursor (I) in the first stream 970A and the aqueous liquid (g) of the acidifying agent (II) in the second stream 970B. It is transferred to the inside 970C of the chlorine dioxide generation / bleaching member 9b. In this way, the aqueous liquid (f) of the bleach precursor (I) and the aqueous liquid (g) of the acidifying agent (II) are mixed, and the acidic aqueous liquid (a) of the bleach precursor (I) is mixed. ) Is prepared to generate gaseous chlorine dioxide (step 6-2). The generated gaseous chlorine dioxide moves, for example, automatically or actively in the pores or voids of the moisture permeable / waterproof material 920, exits the device, and is retained in the chlorine dioxide trap member. b) is reached (step 6-3). The moving gas chlorine dioxide is absorbed and dissolved in the aqueous liquid (b) held in the chlorine dioxide trap member, and the aqueous liquid (c) containing chlorine dioxide is obtained (step 6-4). By bringing the aqueous liquid (c) containing chlorine dioxide obtained in step 6-4 into contact with the teeth (step 6-5), tooth bleaching proceeds.

In the tooth bleaching method (7) of the present invention, the tooth bleaching device prepared by using the kit (1) or (2) for preparing the tooth bleaching device of the present invention is used. The chlorine dioxide trap member may or may not be present. The tooth bleaching method (7) is a step 7-1 of applying an aqueous gel which is a kind of an aqueous liquid (b) to a tooth, and bleaching containing chloric acid or a salt thereof in the prepared tooth bleaching device. Step 7-2 of preparing the acidic aqueous liquid (a) of the agent precursor (I) and generating gaseous chlorine dioxide, and step 7- of causing the generated gaseous chlorine dioxide to reach the aqueous gel applied to the teeth. 3. Includes step 7-4 in which the aqueous gel applied to the teeth absorbs the moving gaseous chlorine dioxide to obtain an aqueous gel containing chlorine dioxide. In step 7-3, the gaseous chlorine dioxide exits the device and is applied to the teeth through the moisture permeable / waterproof material or through the moisture permeable / waterproof material and the chlorine dioxide trap member. Reach an aqueous gel.

Specifically, the method of using the kit (1) shown in FIG. 11 is as follows. First, an aqueous gel, which is a kind of aqueous liquid (b), is applied to the teeth (step 7-1). The screw portion 850 of the rotary moving member 8b is screwed into the hollow container 8a. The rotary moving member 8b is rotated by holding the operation unit 855 so that the piercing portion 853 reaches the partition wall 860, and the partition wall 860 is removed or a hole is made in the partition wall 860. As a result, the first chamber 870A and the second chamber 870B communicate with each other, and the solid acidifying agent (II') is dissolved in the aqueous liquid (f) of the bleaching agent precursor (I), and the bleaching agent precursor (I) is dissolved. ), The acidic aqueous liquid (a) is prepared to generate gaseous chlorine dioxide (step 7-2). The generated gaseous chlorine dioxide moves, for example, automatically or actively through the pores or voids of the moisture permeable / waterproof material 820, exits the device, and reaches the aqueous gel applied to the teeth (step). 7-3). The gaseous chlorine dioxide that has reached the aqueous gel is absorbed and dissolved in the aqueous gel, resulting in an aqueous gel containing chlorine dioxide (steps 7-4). The aqueous gel applied to the teeth promotes tooth bleaching. This aqueous gel containing chlorine dioxide is a kind of aqueous liquid (c).

Specifically, the method of using the kit (2) shown in FIG. 12 is as follows. First, an aqueous gel, which is a kind of aqueous liquid (b), is applied to the teeth (step 7-1). The sealing material 960 is removed, and a chlorine dioxide generating / bleaching member 9b is attached instead. The operation unit 950 is pushed into the aqueous liquid (f) of the bleach precursor (I) in the first stream 970A and the aqueous liquid (g) of the acidifying agent (II) in the second stream 970B. It is transferred to the inside 970C of the chlorine dioxide generation / bleaching member 9b. In this way, the aqueous liquid (f) of the bleach precursor (I) and the aqueous liquid (g) of the acidifying agent (II) are mixed, and the acidic aqueous liquid (a) of the bleach precursor (I) is mixed. ) Is prepared to generate gaseous chlorine dioxide (step 7-2). The generated gaseous chlorine dioxide moves, for example, automatically or actively through the pores or voids of the moisture permeable / waterproof material 920, exits the device and reaches the aqueous gel applied to the teeth (step). 7-3). The gaseous chlorine dioxide that has reached the aqueous gel is absorbed and dissolved in the aqueous gel, resulting in an aqueous gel containing chlorine dioxide (steps 7-4). The aqueous gel applied to the teeth promotes tooth bleaching. This aqueous gel containing chlorine dioxide is a kind of aqueous liquid (c).

The tooth bleaching method (8) of the present invention is a tooth bleaching device prepared by using the tooth bleaching device preparation kit (1) or (2) of the present invention, at one end of the kit. Use a material whose outermost layer is a moisture-permeable / waterproof material (in other words, one that does not have a chlorine dioxide trap member). The tooth bleaching method (8) is a step 8-1 in which an aqueous gel, which is a kind of an aqueous liquid (b), is held on the outer surface of a moisture permeable / waterproof material, in the tooth bleaching device. Step 8-2, in which the acidic aqueous liquid (a) of the bleach precursor (I) containing chloric acid or a salt thereof is prepared to generate gaseous chlorine dioxide, the generated gaseous chlorine dioxide is transferred to allow moisture permeation. -Step 8-3 to reach the aqueous gel held on the outer surface of the waterproof material, the aqueous gel held on the outer surface of the moisture permeable / waterproof material absorbs the moving gaseous chlorine dioxide. , 8-4 to obtain an aqueous gel containing chlorine dioxide, and 8-5 to bring the obtained aqueous gel containing chlorine dioxide into contact with the teeth.

Specifically, the method of using the kit (1) shown in FIG. 11 is as follows. First, an aqueous gel, which is a kind of aqueous liquid (b), is applied and held on the outer surface of the moisture permeable / waterproof material 820 (step 8-1). The screw portion 850 of the rotary moving member 8b is screwed into the hollow container 8a. The rotary moving member 8b is rotated by holding the operation unit 855 so that the piercing portion 853 reaches the partition wall 860, and the partition wall 860 is removed or a hole is made in the partition wall 860. As a result, the first chamber 870A and the second chamber 870B communicate with each other, and the solid acidifying agent (II') is dissolved in the aqueous liquid (f) of the bleaching agent precursor (I), and the bleaching agent precursor (I) is dissolved. ), The acidic aqueous liquid (a) is prepared and gaseous chlorine dioxide is generated (step 8-2). The generated gaseous chlorine dioxide moves, for example, automatically or actively in the pores or voids of the moisture permeable / waterproof material 820, exits the device, and on the outer surface of the moisture permeable / waterproof material 820. Reach the aqueous gel retained in (step 8-3). The gaseous chlorine dioxide that has reached the aqueous gel is absorbed and dissolved in the aqueous gel, and as a result, an aqueous gel containing chlorine dioxide is obtained (step 8-4). By bringing the aqueous gel containing chlorine dioxide into contact with the teeth (step 8-5), tooth bleaching proceeds. This aqueous gel containing chlorine dioxide is a kind of aqueous liquid (c).

Specifically, the method of using the kit (2) shown in FIG. 12 is as follows. First, an aqueous gel, which is a kind of aqueous liquid (b), is applied and held on the outer surface of the moisture permeable / waterproof material 920 (step 8-1). The sealing material 960 is removed, and a chlorine dioxide generating / bleaching member 9b is attached instead. The operation unit 950 is pushed into the aqueous liquid (f) of the bleach precursor (I) in the first stream 970A and the aqueous liquid (g) of the acidifying agent (II) in the second stream 970B. It is transferred to the inside 970C of the chlorine dioxide generation / bleaching member 9b. In this way, the aqueous liquid (f) of the bleach precursor (I) and the aqueous liquid (g) of the acidifying agent (II) are mixed, and the acidic aqueous liquid (a) of the bleach precursor (I) is mixed. ) Is prepared to generate gaseous chlorine dioxide (step 8-2). The generated gaseous chlorine dioxide moves, for example, automatically or actively in the pores or voids of the moisture permeable / waterproof material 920, and becomes an aqueous gel held on the outer surface of the moisture permeable / waterproof material 920. Reach (step 8-3). The gaseous chlorine dioxide that has reached the aqueous gel is absorbed and dissolved in the aqueous gel, and as a result, an aqueous gel containing chlorine dioxide is obtained (step 8-4). By bringing the aqueous gel containing chlorine dioxide into contact with the teeth (step 8-5), tooth bleaching proceeds. This aqueous gel containing chlorine dioxide is a kind of aqueous liquid (c).

Hereinafter, it is shown by experimental examples that the bleaching action is exhibited by the present invention.
(Experimental Example 1) Bleaching of brown chicken egg shell A hydrophilic polyester woven cloth (chlorine dioxide) is applied to a hydrophobic porous polyurethane film (corresponding to a moisture-permeable / waterproof material) so as not to block all the holes. A tooth bleaching experiment was conducted using a moisture-permeable waterproof cloth made by Yamahon with (corresponding to a trap member) attached.

(1) Preparation of gaseous chlorine dioxide generation aqueous solution 50 μL of 30 w / v% sodium chlorite aqueous solution, 207.6 μL of water, 2.4 μL of platinum nanocolloid solution (platinum content: 0.02% by weight) and 3M 40 μL of sulfuric acid was added in this order. After adding sulfuric acid, it was heated at 40 ° C. for 5 minutes. The obtained aqueous solution contains an excess amount of acid (sodium chlorite concentration: 5 w / v%, pH 2 or less) so that gaseous chlorine dioxide is easily generated.

(2) Bleaching operation A part of the polyester woven cloth of the breathable tarpaulin is soaked with 20 μL of water (corresponding to the aqueous liquid (b)), and the wet part of the moisture permeable tarpaulin is covered with the polyester woven cloth. It was attached to the surface of the brown chicken egg so as to face the surface. 50 μL of the aqueous solution for chlorine dioxide generation (corresponding to the aqueous liquid (a)) prepared in (1) was placed on the back side soaked with water, that is, on the polyurethane film of the moisture-permeable waterproof cloth. A food wrap film was put on the aqueous solution, and the aqueous solution was sandwiched between the wrap film and a moisture-permeable waterproof cloth. In this way, the emission of the generated gas chlorine dioxide to the outside air was simply suppressed. This condition was maintained for 5 minutes, after which the plastic wrap and the breathable tarpaulin were removed and the brown eggs were lightly washed with water.

At the end of bleaching, the water soaked in the polyester woven cloth of the breathable tarpaulin was yellowish, and when the water was soaked in the pH test paper, the pH was 5 to 6. From these facts, it was suggested that only gaseous chlorine dioxide permeated the polyurethane film of the moisture-permeable waterproof cloth.

(3) Calculation of Dye Deviation ΔE ^* _ab The color of the shell of brown chicken eggs was measured using a crystal eye manufactured by Olympus Corporation before and after the bleaching treatment. Specifically, regarding the color of the shell of the brown chicken egg before the bleaching treatment and the color of the place where the filter paper after the bleaching treatment was attached, the difference in the tendency of black and white ΔL ^* , the difference in the tendency of red-green Δa ^* , and yellow The difference Δb ^* of the tendency of blue was obtained, and the dye deviation ΔE ^* _ab was calculated from these values according to the following formula. The results are shown in Table 1.

As shown in Table 1, the pigment deviation ΔE ^* _ab before and after bleaching was 5.69, which indicates that the shell of the brown chicken egg was significantly bleached. If bleaching is not performed, all of ΔL ^* , Δa ^* and Δb ^* are about 0. From this result, it can be confirmed that the bleaching effect of chlorine dioxide can be obtained by the aqueous solution obtained by permeating the gaseous chlorine dioxide through the polyurethane film of the moisture-permeable waterproof cloth and dissolving it in the water held in the polyester woven cloth. It was.

(Experimental Example 2) Effect of salt on the production of gaseous chlorine dioxide I want to generate more gaseous chlorine dioxide from chlorous acid or an acidic aqueous liquid containing the salt. Therefore, it was examined whether or not the amount of chlorine dioxide produced in the gas was increased by adding inorganic chloride to the acidic aqueous liquid. In this experiment, sodium chloride and lithium chloride were used.

(1) Manufacture of a device used in the experiment A 1.5 mL microtube was cut at a portion 1 cm below the lid portion, and the cut surface was rubbed flat with a file. The surface of the polyurethane film of a moisture-permeable and waterproof cloth (manufactured by Yamahon Co., Ltd .; composed of a porous polyurethane film and a polyester woven cloth) was adhered to the cut surface using a water-insoluble adhesive without any gaps. Next, an adhesive was applied to the surface of the polyester woven cloth of the moisture-permeable waterproof cloth according to the cut surface of the microtube, and a filter paper was attached. After the adhesive had dried, the moisture permeable tarpaulin and filter paper were cut to fit the shape and size of the cut surface of the microtube. An outline (cross-sectional view) of the device manufactured in this manner is shown in FIG. 13 (1). In the figure, reference numeral 88 is a moisture-permeable waterproof cloth, reference numeral 81 is a porous polyurethane film, reference numeral 82 is a polyester woven cloth, and reference numeral 83 is a filter paper.

(2) Preparation of acidic aqueous liquid containing sodium chlorite and collection to the device produced in (1) The liquids 2-1 to 2-4 containing sodium chlorite shown in Table 2 were prepared. To 130 μL of these aqueous liquids containing sodium chlorite, 20 μL of 85% w / v phosphoric acid was added. As a result, the concentration of sodium chlorite in the obtained acidic aqueous liquid was 3% by weight, and the concentration of the platinum / nanocolloid stock solution was 0.8% by weight (the platinum concentration was 0.00016% by weight). After adding phosphoric acid, each acidic aqueous liquid was stirred with a tabletop stirrer for 5 seconds, and after 10 seconds, 50 μL of the liquid was placed in the device manufactured in (1) and the lid was closed. A cross-sectional view of the state with the lid closed is shown in FIG. 13 (2). In the figure, reference numerals 81 to 83 and 88 are as described above, and reference numeral 80 is an acidic aqueous liquid containing sodium chlorite.

(3) Equipment and measurement for measuring the amount of chlorine dioxide produced in gas A container containing an acidic aqueous liquid containing sodium chlorite prepared in (2) is placed inside a Styrofoam box with an internal volume of 20.8 L. , The styrofoam lid was closed. The styrofoam lid had a small hole with a diameter of about 5 mm, and a silicone tube was inserted into the hole. A 60 cc syringe was connected to the outer end of the tube. After 5 minutes had passed after closing the lid, the air inside the box was agitated by pistoning the syringe 20 times. The silicone tube is pulled out, and instead, a gas chlorine dioxide detector tube (Gastec No. 23M; detection range: 0.5 to 12 ppm) is inserted into the hole, and the gas inside is sucked in to gas dioxide. The concentration of chlorine was determined. This chlorine dioxide is generated in the container shown in FIG. 13 (2) and comes out of the container through a moisture-permeable waterproof cloth and a filter paper.
The results are shown in Table 2.

As is clear from the results in Table 2, it was found that the addition of inorganic chloride to the acidic aqueous liquid containing sodium chlorite clearly increased the amount of gaseous chlorine dioxide produced. It was also found that the amount of chlorine dioxide produced in the gas increases as the content of inorganic chloride increases.

(Experimental Example 3) Effect of Water and Acetone as Chlorine Dioxide Trap Agent In the present invention, the generated gaseous chlorine dioxide is captured by absorbing and dissolving it in the liquid held in the chlorine dioxide trap member. Therefore, water and water / acetone were selected as the liquids to be retained in the chlorine dioxide trap member, and it was examined which one traps more gaseous chlorine dioxide.

(1) Manufacture of device used for experiment The same as (1) of Experimental Example 2. However, a filter paper, which is a chlorine dioxide trap member, impregnated with 40 μL of the liquid shown in Table 3 was also prepared.

(2) Preparation of an acidic aqueous liquid containing sodium chlorite and collection to the device manufactured in (1) Experimental Example 2 (2) No. A liquid similar to 2-3 (containing NaCl at a concentration of 4M) was used and housed in the device manufactured in (1).

(3) Device and measurement for measuring the amount of chlorine dioxide produced in the gas Using the same device as in (3) of Experimental Example 2, the chlorine dioxide concentration of the gas in the gas inside the Styrofoam box was measured by the same method. .. When the filter paper was not impregnated with anything (Experimental Example No. 2-3 of Experimental Example 2), the chlorine dioxide concentration (3.4 ppm) of the gas in the Styrofoam box was set to 100%, and the filter paper was impregnated with the liquid. The rate of decrease in the chlorine dioxide concentration of the gas in the example was calculated.
The results are shown in Table 3.

As is clear from the results in Table 3, even if the filter paper, which is a chlorine dioxide trap member, is impregnated with water as a chlorine dioxide trap agent, the amount of gaseous chlorine dioxide emitted into the Styrofoam box is about 59%. It was confirmed that the amount was reduced (that is, the gaseous chlorine dioxide was trapped in the water soaked in the filter paper). Moreover, when the filter paper was impregnated with water / acetone, the amount of gaseous chlorine dioxide emitted into the inside of the Styrofoam box was further reduced. From these results, it was considered that even if the trapping agent is water, the gaseous chlorine dioxide is efficiently trapped, and if the trapping agent is water / acetone, the trapping amount of the gaseous chlorine dioxide is further increased.
The pH of the liquid (the liquid soaked in the filter paper) that absorbed the gaseous chlorine dioxide was neutral (pH = about 6).

(Experimental Example 4) Reduction of the concentration of chlorine dioxide in the gas emitted The activated carbon sheet was wrapped around the device manufactured in (1) of Experimental Example 2 and the effect of the activated carbon sheet on the amount of chlorine dioxide emitted in the gas was examined.

(1) Manufacture of a device used in the experiment A device similar to (1) of Experimental Example 2 was manufactured. Separately, cut an activated carbon sheet (Futamura Chemical Co., Ltd., KFF-002) to 1 cm x 5 cm, fold this short side so that its length is halved, and bond it with an adhesive to activate 0.5 cm x 5 cm activated carbon. It was a sheet. This activated carbon sheet was wrapped around the outer peripheral portion of the moisture-permeable waterproof cloth and the filter paper portion of the separately manufactured device, and this was also adhered with an adhesive. A cross-sectional view of this state is shown in FIG. 14 (1). In the figure, reference numerals 80 to 83 and 88 are as described above, and reference numeral 84 is an activated carbon sheet. In addition, during this experiment, the filter paper 83 was impregnated with 40 μL of water.

(2) Preparation of an acidic aqueous liquid containing sodium chlorite and collection to the device manufactured in (1) Experimental Example 2 (2) No. A liquid similar to 2-3 (containing NaCl at a concentration of 4M) was used and housed in the device manufactured in (1).

(3) Device and measurement for measuring the amount of chlorine dioxide produced in the gas Using the same device as in (3) of Experimental Example 2, the chlorine dioxide concentration of the gas in the gas inside the Styrofoam box was measured by the same method. .. However, the gas detector tube is No. 1 manufactured by Gastec. 23 L (detection range: 0.05 to 1.2 ppm) was used.

The measured chlorine dioxide concentration of the gas is 0.45 ppm, and when the filter paper is not impregnated with anything (Experimental Example No. 2-3 of Experimental Example 2), the chlorine dioxide concentration of the gas (3.4 ppm) On the other hand, the rate of decrease was 86.8%.

(Experimental Example 5) Bleaching of the shell of a brown chicken egg The shell of a brown chicken egg was bleached with a device using the same activated carbon sheet as in Experimental Example 4.

(1) Manufacture of a device used in an experiment A device made of an activated carbon sheet was manufactured by the same method as in (1) of Experimental Example 4. However, the size of the activated carbon sheet used was as shown in Table 4. In addition, Experimental Example No. In 5-1 the activated carbon sheet was folded and used in the same manner as in Experimental Example 4, but Experimental Example No. For 5-2 and 5-3, they were used without folding.

In this experiment, the device was pressed against the shell of a brown chicken egg. A cross-sectional view of the shape of the device at that time is shown in FIG. 14 (2). The meaning of the reference numerals in the figure is the same as the meaning of the reference numerals in FIG. 14 (1).

Approximately 9 g of water was added to 0.25 g of carboxyvinyl polymer (Carbopol 940 manufactured by Iwase Cosfa), then 20 μL of 5N sodium hydroxide was added for pH adjustment (pH = 7), and finally water was added again to make the total amount. Was 10 g. In this way, a neutral aqueous gel was prepared. About 40 mg of this aqueous gel was applied as a chlorine dioxide trapping agent to the filter paper of the device used in the experiment.

(2) Preparation of an acidic aqueous liquid containing sodium chlorite and collection to the device manufactured in (1) Experimental Example 2 (2) No. A liquid of 2-3 (containing NaCl at a concentration of 4M) was used and housed in the device manufactured in (1).

(3) Equipment and measurement for bleaching the shell of brown chicken eggs and the amount of chlorine dioxide produced in the gas For the shells of brown chicken eggs, the bleached part is color-measured using a crystal eye manufactured by Olympus Corporation. The color was used before bleaching.

A device manufactured in (1) and to which an acidic aqueous liquid containing sodium chlorite described in (2) was added to the portion of the egg shell to be bleached, and the gelled surface of the egg It was placed on the chicken egg so that it touched the shell. After maintaining this state for 5 minutes, the device was removed from the shell of the brown chicken egg, the gel was washed away, and the bleached portion was colored with a crystal eye to obtain the color after bleaching. From the values before and after bleaching, the difference ΔL * of the black-and-white tendency, the difference Δa * of the red-green tendency, and the difference Δb * of the yellow-blue tendency were obtained, and from these values, the dye deviation ΔE was obtained according to the above equation 1. * _Ab was calculated. The results are shown in Table 4.

From the results in Table 4, it was confirmed that bleaching proceeded in all the experimental examples regardless of the size of the activated carbon sheet at the size used in this experiment.

1a, 1b, 2,3,4,5a, 5b, 6,7 Tooth bleaching device 101,201 1st accommodating member 102 2nd accommodating member 301 3rd accommodating member 111,211 1st accommodating member Damage member 112 2nd accommodating member damage member 311 3rd accommodating member damage member 110, 210, 310, 410A, 410B, 510, 610, 710 Cover material 120, 220, 320, 420, 520, 620, 720, 820, 920 Transparent Wet / waterproof material 130, 230, 330, 430, 530, 630, 730 Chlorine dioxide trap member 190 Polymer sheet 460, 560, 660, 860 Partition wall 461,561,50 Notch 1000, 1100, 2000, 3000, 4000 , 5000, 5100, 6000 External member SP Closed space

Claims (27)

Step 1-1 of preparing an acidic aqueous liquid (a) of the bleach precursor (I) containing chloric acid or a salt thereof to generate gaseous chlorine dioxide, an aqueous liquid containing no substance that reacts with chlorine dioxide. In step (b), the generated gaseous chlorine dioxide is absorbed to obtain the aqueous liquid (c) containing chlorine dioxide, and the aqueous liquid (c) containing chlorine dioxide obtained in steps 1-2 is applied. A method for bleaching cosmetic teeth, which comprises steps 1-3 of contacting the teeth. The cosmetic tooth bleaching method according to claim 1, wherein the aqueous liquid (b) and the aqueous liquid (c) are aqueous gels. Step 2-1 of applying the aqueous gel to the teeth, step 2-2 of preparing the acidic aqueous liquid (a) of the bleach precursor (I) containing chlorous acid or a salt thereof and generating gaseous chlorine dioxide. A method for bleaching a tooth for cosmetic purposes, which comprises a step 2-3 in which an aqueous gel applied to the tooth and the gaseous chlorine dioxide generated in step 2-2 are absorbed. An external member provided with a waterproof cover material and a moisture-permeable / waterproof material, a bleach precursor (I) containing chloric acid or a salt thereof existing in a closed space inside the external member, and an aqueous solution thereof are acidic. A tooth bleaching device comprising an acidifying agent (II) containing a substance and a member for preventing contact between the bleaching agent precursor (I) and the acidifying agent (II), wherein the bleaching agent precursor (I) and In the acidifying agent (II), at least one of them is in the form of an aqueous liquid (d), or both the bleach precursor (I) and the acidifying agent (II) are solid and the external member. In the closed space inside, in a form that does not come into contact with the bleach precursor (I) and the acidifying agent (II), chloric acid, chlorite, a substance whose aqueous solution shows acidity, or chlorine dioxide When an aqueous liquid (e) containing no reactive substance is present and the bleach precursor (I) is in the form of the aqueous liquid (d), the pH (25 ° C.) of the aqueous liquid is 9-14. A device for bleaching teeth, which has a structure capable of preparing an acidic aqueous liquid (a) containing a bleaching agent precursor (I) and an acidifying agent (II) in a closed space when the device is used. .. The device for bleaching teeth according to claim 4, which is a waterproof cover material and a moisture permeable / waterproof device that is connected to the end portion of the cover material and forms a closed space inside the cover material together with the cover material. An aqueous liquid (f) of a bleaching agent precursor (I) containing a chloric acid or a salt thereof in an external member provided with a material and in a closed space inside the external member, and having a pH (25 ° C.). ) Is 9 to 14, a waterproof first accommodating member, and an aqueous liquid (g) of an acidifying agent (II) containing a substance whose aqueous solution shows acidity is contained therein. A waterproof second accommodating member, a first accommodating member breaking member, and a second accommodating member breaking member are provided, and the first accommodating member damaging member and the second accommodating member breaking member are the first accommodating member and the second accommodating member, respectively. (Ii) A device characterized by being in a position where the accommodating member can be damaged. The device for bleaching teeth according to claim 4, which is a waterproof cover material and a moisture permeable / waterproof device that is connected to the end portion of the cover material and forms a closed space inside the cover material together with the cover material. An aqueous liquid (f) of a bleach precursor (I) containing chlorous acid or a salt thereof in an external member provided with a material and in a closed space inside the external member, and having a pH (25 ° C.). ) Is 9 to 14, a waterproof first accommodating member, a solid acidifying agent (II') containing a substance whose aqueous solution is acidic, and a member for damaging the first accommodating member. A device comprising, the first accommodating member breaking member is present at a position where the first accommodating member can be damaged. The device for bleaching teeth according to claim 4, which is a waterproof cover material and a moisture permeable / waterproof device that is connected to the end portion of the cover material and forms a closed space inside the cover material together with the cover material. An external member provided with a material, and a bleaching agent precursor (I') containing a solid chlorite in a closed space inside the external member, and an acidifying agent containing a substance in which the aqueous solution shows acidity. A waterproof second accommodating member accommodating the aqueous liquid (g) of (II) and a second accommodating member breaking member are provided, and the second accommodating member breaking member is located at a position where the second accommodating member can be damaged. A device characterized by being present. The device for bleaching teeth according to claim 4, which is a moisture-permeable / waterproof device that is connected to a waterproof cover material and the end portion of the cover material and forms a closed space inside the cover material together with the cover material. An aqueous component containing a material, and an aqueous solution containing no chlorite, chlorite, a substance whose aqueous solution is acidic, or a substance that reacts with chlorine dioxide in the closed space inside the external member. A waterproof third containing member containing the liquid (e), a bleach precursor (I') containing a solid chlorite, and an acidifying agent containing a solid substance whose aqueous solution exhibits acidity ( II'), a member for preventing contact between the bleach precursor (I') and the acidifying agent (II'), and a member for damaging the third accommodating member, and the contact preventing member permeates the aqueous liquid (e). A device that is either sex or water soluble and that the third containment member breaking member is located at a position where the third containment member can be broken. The tooth bleaching device according to any one of claims 5 to 8, wherein a water permeable substrate is present inside the closed space, and the breaking member is formed on the water permeable substrate. The first chamber of the tooth bleaching device according to claim 4, which is defined by a waterproof cover material (x) and a waterproof partition wall connected to the end portion of the cover material (x). A partition wall, a waterproof cover material (y) in which one end is connected to the end of the partition on the side where the cover material (x) does not exist, and the other end of the cover material (y). It has a second chamber defined by a breathable / waterproof material connected to the part, and one of the first chamber and the second chamber contains a bleach precursor (I) containing chloric acid or a salt thereof. On the other side, an acidifying agent (II) containing a substance whose aqueous solution is acidic is contained, and at least one of the bleach precursor (I) and the acidifying agent (II) is an aqueous liquid. When present in the form of (d) and the bleach precursor (I) is in the form of an aqueous liquid (d), the pH (25 ° C.) of the aqueous liquid is 9-14 and the partition is broken. A device characterized by being able to be. The first chamber of the tooth bleaching device according to claim 4, which is defined by a waterproof cover material (z) and a waterproof partition wall connected to the end portion of the cover material (z), and the said. The first chamber and the second chamber are provided with a partition wall and a second chamber defined by a moisture-permeable / waterproof material connected to the end portion of the partition wall on the side where the cover material (z) does not exist. One contains a bleach precursor (I) containing chloric acid or a salt thereof, and the other contains an acidifying agent (II) containing a substance whose aqueous solution is acidic. At least one of the bleach precursor (I) and the acidifying agent (II) is present in the form of the aqueous liquid (d), and the bleach precursor (I) is in the form of the aqueous liquid (d). The device, wherein the aqueous liquid has a pH (25 ° C.) of 9 to 14, and the partition wall can be broken. There is an aqueous liquid (f) of bleach precursor (I) in the first chamber and a solid acidifying agent (II') in the second chamber, or an acidifying agent (II') in the first chamber. There is an aqueous liquid (g) of II) and there is a bleach precursor (I') containing a solid chlorite in the second chamber, or there is a bleach precursor (I) in the first chamber. Aqueous liquid (f) is present and the aqueous liquid (g) of the acidifying agent (II) is present in the second chamber, or the aqueous liquid (g) of the acidifying agent (II) is present in the first chamber. The tooth bleaching device according to claim 10 or 11, wherein the aqueous liquid (f) of the bleaching agent precursor (I) is present in the second chamber. 12. The eleventh claim, wherein in the second chamber, a solid acidifying agent (II') or a bleach precursor (I') containing a solid chlorite is retained in a liquid-absorbing / retaining member. Tooth bleaching device. The tooth bleaching device according to claim 4, wherein the outer peripheral portion of the waterproof cover material (r) is adhered to one surface of the waterproof partition wall and a part thereof. The first chamber and the second chamber defined by adhering the outer peripheral portion of another waterproof cover material (s) to the other part on the same surface of the waterproof partition wall are provided. , The first chamber and the second chamber are adjacent to each other via the adhesive portion of the cover material (r) and (s) to the partition wall, and one of the first chamber and the second chamber is chlorinated. Alternatively, an aqueous liquid (f) of the bleaching agent precursor (I) containing a salt thereof and having a pH (25 ° C.) of 9 to 14 is contained, and on the other hand, the aqueous solution exhibits acidity. The aqueous liquid (g) of the acidifying agent (II) containing a substance is contained, and the partition wall has a notch that opens on the side where the cover materials (r) and (s) do not exist, and the notch is It is covered with a liquid absorbing / retaining member, and a moisture permeable / waterproofing material is adhered to the side where the cover materials (r) and (s) of the partition wall do not exist, and the liquid absorbing / retaining member. The surface of the chamber is covered with a moisture-permeable / waterproof material, and as a result, a third chamber for accommodating a liquid-absorbing / retaining member is formed. When broken at the notch, each opening is formed, and the aqueous liquid (f) of the bleaching agent precursor (I) and the aqueous liquid (g) of the acidifying agent (II) are simultaneously released. A device characterized by being. The tooth bleaching device according to any one of claims 4 to 14, further comprising a chlorine dioxide trap member on the outer surface of a moisture permeable / waterproof material. The tooth bleaching device according to claim 15, wherein a polymer film or sheet is provided on the outer surface of the chlorine dioxide trap member. A chlorine dioxide trap layer is provided on the surface of the chlorine dioxide trap member on the side opposite to the moisture permeable / waterproof material and on the outer peripheral portion thereof, and / or on the outside of the chlorine dioxide trap member. The tooth bleaching device according to claim 15 or 16. The tooth bleaching device according to claim 17, wherein the chlorine dioxide trap layer comprises activated carbon. Step 3-1 of the step 3-1 of causing the chlorine dioxide trap member of the tooth bleaching device according to any one of claims 15 to 18 to hold an aqueous liquid (b) containing no substance that reacts with chlorine dioxide. In the bleaching device, the acidic aqueous liquid (a) of the bleach precursor (I) containing chlorine acid or a salt thereof is prepared, and the gas chlorine dioxide is generated in step 3-2, the generated gas dioxide. Step 3-3 to move chlorine to reach the aqueous liquid (b) held in the chlorine dioxide trap member, the chlorine dioxide of the transferred gas is absorbed by the aqueous liquid (b) held in the chlorine dioxide trap member. For beauty use, which comprises a step 3-4 to obtain an aqueous liquid (c) containing chlorine dioxide, and a step 3-5 to bring the aqueous liquid (c) containing chlorine dioxide obtained in step 3-4 into contact with the teeth. How to bleach your teeth. The acidity of the bleach precursor (I) containing chloric acid or a salt thereof in the tooth bleaching device according to any one of the steps 4-1 of applying the aqueous gel to the teeth and claims 4 to 18. Step 4-2 to prepare the aqueous liquid (a) of the above and generate gaseous chlorine dioxide, step 4-3 to bring the generated gaseous chlorine dioxide to the aqueous gel applied to the teeth, and applied to the teeth. A method for bleaching teeth for beauty, which comprises a step 4-4 in which an aqueous gel absorbs the moving gaseous chlorine dioxide to obtain an aqueous gel containing chlorine dioxide. A cosmetic tooth bleaching method using the device for bleaching teeth according to any one of claims 4 to 14, which has a moisture permeable / waterproof material portion on the outermost side thereof. Step 5-1 of holding the aqueous gel on the outer surface of the wet / waterproof material, in the tooth bleaching device, the acidic aqueous liquid of the bleach precursor (I) containing chloric acid or a salt thereof ( Step 5-2 of preparing a) and generating gaseous chlorine dioxide, step 5-2 of moving the generated gaseous chlorine dioxide to reach the aqueous gel held on the outer surface of the moisture permeable / waterproof material. 3. Step 5-4 to obtain an aqueous gel containing chlorine dioxide by absorbing the chlorine dioxide of the moving gas into the aqueous gel held on the outer surface of the moisture permeable / waterproof material, and the obtained chlorine dioxide. A method comprising contacting a tooth with an aqueous gel comprising. The tooth bleaching kit for preparing a tooth bleaching device according to claim 4, which includes a hollow container and a rotationally moving member screwed into one end of the hollow container, and is an external member of the hollow container. Is provided with a cylindrical and hollow waterproof cover material, a waterproof sealing material that closes one end of the cover material, and a moisture-permeable / waterproof material that closes the other end of the cover material, and is provided inside the hollow container. It has a female threaded portion at the end on the side where the sealing material exists, a waterproof partition wall is provided between the female threaded portion and the other end, and the inside of the hollow container is connected in series by the partition wall. It is divided into two side-by-side chambers, one of which contains a bleaching agent precursor (I) containing chloric acid or a salt thereof, and the other of which contains an acidifying agent (II) containing a substance whose aqueous solution is acidic. When at least one of the bleaching agent precursor (I) and the acidifying agent (II) is in the form of an aqueous liquid (d) and the bleaching agent precursor (I) is in the form of an aqueous liquid (d). , The pH (25 ° C.) of the aqueous liquid is 9 to 14, and the rotary moving member has a male threaded portion, and the sealing material at one end of the hollow container is removed or a hole is made in the hollow container. When a threaded portion is inserted at one end and screwed into the female threaded portion and the rotary moving member is advanced in the hollow container, the first chamber and the second chamber of the hollow container are communicated with each other. Kit for. The tooth bleaching kit for preparing a tooth bleaching device according to claim 4, wherein a dual syringe made of a waterproof material and chlorine dioxide generation / bleaching bonded to one end of the dual syringe. Featuring components, the dual syringe consists of a first and second stream arranged in parallel and two pistons with gaskets at the tips, each inserted into the stream from one end of those streams. Bleach precursors, with encapsulants closing the other ends of those streams, the encapsulants are removable and one of the first and second streams contains chloric acid or a salt thereof. The aqueous liquid (g) of the acidifying agent (II) containing the aqueous liquid (f) of (I) having a pH (25 ° C.) of 9 to 14 and a substance whose aqueous solution is acidic. ) Exists, the chlorine dioxide generating / bleaching member has a hollow structure, one end of which is removable to the other end of the first and second streams of the dual syringe from which the sealing material has been removed. A tooth bleaching kit with other edges closed with a breathable and waterproof material. The tooth bleaching kit according to claim 22 or 23, which comprises a chlorine dioxide trap member on the outer surface of a moisture permeable / waterproof material. Step 6-1 of causing the chlorine dioxide trap member of the tooth bleaching device prepared by using the tooth bleaching kit according to claim 24 to hold an aqueous liquid (b) containing no substance that reacts with chlorine dioxide. Step 6-2, in which the acidic aqueous liquid (a) of the bleach precursor (I) containing chloric acid or a salt thereof was prepared in the tooth bleaching device to generate gaseous chlorine dioxide, occurred. Step 6-3 to move the gaseous chlorine dioxide to reach the aqueous liquid (b) held in the chlorine dioxide trap member, the carbon dioxide of the transferred gas to the aqueous liquid (b) held in the chlorine dioxide trap member. It includes steps 6-4 of absorbing chlorine to obtain an aqueous liquid (c) containing chlorine dioxide, and steps 6-5 of bringing the aqueous liquid (c) containing chlorine dioxide obtained in step 6-4 into contact with teeth. , How to bleach your teeth for beauty. In the tooth bleaching device prepared by using the tooth bleaching kit according to any one of the steps 7-1 of applying the aqueous gel to the teeth and claims 22 to 24, chlorine acid or a salt thereof is applied. Step 7-2 of preparing an acidic aqueous liquid (a) of the bleach precursor (I) containing the mixture to generate gaseous chlorine dioxide, a step of allowing the generated gaseous chlorine dioxide to reach the aqueous gel applied to the teeth. A method for bleaching teeth for cosmetic purposes, which comprises 7-3 and step 7-4 in which the aqueous gel applied to the tooth absorbs the moving gaseous chlorine dioxide to obtain an aqueous gel containing chlorine dioxide. A cosmetic device for bleaching teeth prepared by using the tooth bleaching kit according to claim 22 or 23, which has a moisture permeable / waterproof material portion on the outermost side when the device is used. A method of bleaching teeth, in which the aqueous gel is held on the outer surface of a moisture-permeable / waterproof material, step 8-1, a bleaching agent precursor containing chloric acid or a salt thereof in the device for bleaching the teeth. Step 8-2 of preparing the acidic aqueous liquid (a) of (I) and generating gaseous chlorine dioxide, moving the generated gaseous chlorine dioxide and holding it on the outer surface of the moisture permeable / waterproof material. Step 8-3 to reach the water-based gel, step 8-3 to obtain the water-based gel containing chlorine dioxide by absorbing the chlorine dioxide of the moving gas into the water-based gel held on the outer surface of the moisture-permeable / waterproof material. -4, and a method comprising contacting the resulting aqueous gel containing chlorine dioxide with the teeth 8-5.

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