JPH07100153A - Dental floss - Google Patents

Abstract

PURPOSE:To effectively remove plaques in the areas such as between the teeth, about the gingiva, and the like which are difficult to be brushed by a thread of a dental floss constructed by solid filaments and hollow filaments. CONSTITUTION:This dental floss 1 consists of a handle 2 of the dental floss, a thread 3 and a pick 4. The thread 3 is made of solid filaments and hollow filaments as in the following methods. One is that many hollow filaments 6 are arranged near the outer periphery of a thread 3', many solid filaments 7 are arranged inside and these filaments 6 and 7 are adhered each other by an adhesive 8 or many of the solid filaments 7 are arranged near the outer periphery of the thread 3', many of the hollow filaments 6 are arranged inside and the filaments 6 and 7 are adhered each other by the adhesive 8. One more method is that the solid filaments 7 and the hollow filaments 6 are bound every proper number without using the adhesive 8. The outer diameter of the solid filament 7 is ordinarily 0.1 to 100mum, preferably 3 to 60mum. The outer diameter of the hollow filament 6 is ordinarily 1 to 300mum, preferably 50 to 200mum. The hollow rate is ordinarily 10 to 80%, preferably 15 to 65%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental floss having a novel dental floss yarn.

More specifically, in the present invention, the dental floss yarn is composed of a solid yarn and a hollow fiber, and at least one of the dentifrices is preliminarily provided in the hollow portion of the hollow fiber of the dental floss yarn depending on the use. It relates to dental floss containing ingredients.

[0003]

PRIOR ART Despite the current advances in dental care technology,
Once you have a tooth decay, you have to scrape off the affected area and fill it with metal etc. to prevent it from spreading further.In the case of a permanent tooth, you can never restore the original healthy tooth condition by treatment. The current situation is that it cannot be done. Also, in the case of periodontal disease due to gingivitis and periodontitis (so-called alveolar pyorrhea) as in caries, if left untreated for a long time, it cannot be repaired by treatment and the tooth itself falls out. In recent years, as researches on dental caries and periodontal disease have progressed, the cause of this is that the food residue attached to the tooth surface is decomposed and corroded by a group of bacteria (hereinafter, also simply referred to as plaque) while sleeping. It becomes acidic and the enamel of the tooth surface is eroded and becomes brittle, or the enamel component is decomposed to cause caries, or plaque enters between the tooth and gums and various harmful effects are produced by the plaque. These substances invade teeth and gums and cause inflammation, resulting in periodontal disease.

Therefore, at present, research and development of dental medical technology for caries and periodontal disease are being actively conducted, and for example, a certain kind of bacteria, which is to apply antibiotics to teeth or gums, or to drink them, may be used. I know it can be excluded. However, it is necessary to keep the drug in the mouth for a long time in order to act in the mouth and effectively remove bacteria, but there is a problem that it is difficult to act for a long time because it is shed by saliva or the like. is there. In addition, even if it is applied frequently, the side effects of the drug due to such excessive use become a problem this time, and there is still no effective therapeutic drug for caries and periodontal disease. is there.

[0005] Therefore, regarding the treatment of teeth, a complete treatment technique has not been established, and under the present circumstances, toothpaste is routinely used to brush the toothpaste and bacteria that are the cause of tooth decay and periodontal disease. The most effective measure is to take preventive measures by scraping them off.

Toothbrushes and toothpastes (toothpaste, water toothpaste, moistened toothpaste, powdered toothpaste, solid toothpaste, etc.) are most commonly used as such toothpaste. The dentifrice includes an abrasive (calcium carbonate, etc.) that removes the tar and coloring of cigarettes adhering to the tooth surface, a moistening agent (glycerin, etc.) for moisturizing the dentifrice, and a dentifrice in the mouth. Effervescent agent to disperse (such as sodium lauryl sulfate), binding agent (sodium alginate, etc.) to prevent the powder and liquid in dentifrice from separating, flavoring agent (peppermint oil) that gives a refreshing feeling to the mouth Etc.) and agents for preventing tooth decay and periodontal disease (fluorides, enzymes, bactericides, antiphlogistics, etc.) and the like, which can enhance the effect of brushing teeth.

When brushing teeth, the toothpaste is usually applied to the bristles of a toothbrush to brush teeth and gums. However, the toothpaste contains an abrasive, for example, a toothpaste. If you pile up a toothbrush with a full amount and brush as much as possible, not only the cleaning effect such as removing plaque from the tooth surface but also the tooth surface is scraped off, and the tooth that has been scraped once cannot be regenerated. Is. Therefore, it is important to use an appropriate amount of dentifrice, but it is dentally preferable to remove plaque from the tooth surface by brushing physically with toothbrush bristles, preferably without using such an abrasive. Is also said to be excellent.

[0008] Generally, only brushing with toothbrush bristles makes it difficult for brush bristles to enter the tooth surface, such as in the gaps between teeth and near the gums, or because brushing is difficult. It is difficult to completely remove food residue, plaque, etc., that are clogged in the gaps and the gums.

In order to solve these problems, dental floss has been recently developed. This dental floss
Fig. 1 shows a schematic diagram of an example. By inserting the thread of dental floss between the teeth and moving it up and down, only the target part can be intensively cleaned. It is possible to effectively remove the residue such as food residue and plaque.

Most of the current dental floss yarns are solid nylon 6 solid yarns (solid yarns correspond to hollow yarns, and even inside the center of the cross section of the yarn, the so-called circular cross section). It is filled with a constituent material such as a polymer)
It is a bundle of fibers, and in order to have the strength necessary to remove plaque etc. from the tooth surface, it is necessary to have a certain thickness of hair, but if it is too thick hair There was a problem that the foreign matter remained strong when it was put in between the teeth, and there was discomfort when brushing the teeth.

Further, since dental floss conventionally does not contain a dentifrice, only the use of dental floss for toothbrush has no effect on the prevention of bad breath and the prevention of tooth decay and periodontal disease. There was a drawback that you could not feel refreshed in your mouth even if you brush your teeth with.

On the other hand, as a hollow fiber, a polymer film having a large number of fine pores has been conventionally used in the medical field, especially as a material for artificial organs, and is used in a dialysis machine such as an artificial heart lung or artificial kidney. Many reports have been made, and some of them have already been put to practical use. Further, many examples of using it in a filter as a material used as a filtering material for filtering impurities for purification of pure water or ultrapure water used for cleaning electronic parts such as IC are reported. Some have already been put to practical use. Further, from such a filtering technique, the hollow fiber has been used as a filtering material for filtering impurities in general household water purifiers.

However, in the use of such hollow fibers, attention has been paid to the difference in size of particles and the like between the desired substance and the impurities, and the use of such a hollow fiber rather than the porous polymer membrane having a pore size intermediate between the sizes of the desired substance and the impurities. The desired substance and impurities were separated and filtered using the hollow fiber.

Therefore, to date, hollow fibers made of polymer membranes have not been used for conventional separation and filtration media, but rather solid fibers and hollow fibers as constituent members of dental floss in the field of dental medical devices. There has been no report of an example of using a combination of the above and a case where the dental floss contains a dentifrice.

[0015]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a dental floss yarn with sufficient fiber strength and durability to remove plaque and the like on the tooth surface, and in the gap between the teeth. It is intended to provide a dental floss characterized in that it has flexibility to the extent that it does not cause a feeling of foreign matter even when entering.

A further object of the present invention is to provide general household dental floss and / or disposable dental floss (mainly used only once) for short-term use without separately preparing a dentifrice. It is effective in preventing halitosis, preventing gingivitis, preventing alveolar pyorrhea, preventing the development of caries, preventing bleeding, removing tartar, preventing and removing plaque deposits, and / or slightly removing tobacco. The dental floss yarn has sufficient fiber strength and durability to remove plaque on the tooth surface, and is soft enough not to feel a foreign substance even when entering the tooth gap. The purpose is to provide a dental floss that has properties.

[0017]

Means for Solving the Problems The present inventors have been able to effectively remove plaque on the surface of teeth, particularly in areas where it is difficult to brush, such as in the gaps between teeth and in the gums, and have sufficient efficacy in preventing bad breath. As a result of diligent examination of the dental floss obtained in Example 1, it is necessary to use a dental floss thread in combination with a solid thread having sufficient fiber strength and a hollow fiber having flexibility that does not cause discomfort even if it enters a tooth gap. Therefore, it is possible to maintain durability and strength that are almost the same as those of fibers (for example, nylon fibers) made of solid fibers of the same diameter that are generally used as dental floss yarns. Since it can be filled with an agent, it is known that the above objects can be achieved by filling the hollow portion of the hollow fiber with a dentifrice having various effects according to the purpose, and based on this finding, the present invention has been completed. This has led to the.

That is, the object of the present invention can be achieved by a dental floss characterized in that the yarn of the dental floss is composed of a solid yarn and a hollow fiber.

In the present invention, the hollow fiber has an outer diameter of 1 to 300 μm.
m is a dental floss having a hollow ratio of 10 to 80%. The present invention also shows a dental floss in which the hollow fiber is a porous membrane. The present invention also shows a dental floss in which the hollow fiber is a non-porous membrane. Furthermore, the present invention shows a dental floss in which a dentifrice is preliminarily inserted inside the hollow fiber. The present invention further shows a dental floss in which at least one component of a dentifrice is pre-inserted inside the hollow fiber.
The present invention further indicates a dental floss in which the ratio of the number of solid fibers to the number of hollow fibers used is 1: 9 to 8: 2. Furthermore, in the case where the appropriate number of the solid yarns and the appropriate number of the hollow fibers are adhered to each other in the yarn, the solid yarns are often arranged on the outer periphery of the yarn, and the hollow fibers are often arranged on the inner periphery of the yarn. It shows the dental floss placed. Further, in the above-mentioned yarn, when the appropriate number of the solid yarns and the appropriate number of the hollow fibers are adhered to each other, the hollow fibers are often arranged on the outer periphery of the yarn, and the solid yarns are often arranged on the inner periphery of the yarn. It shows the dental floss placed. Furthermore, the yarn represents a dental floss in a state in which the solid yarn and the hollow fiber are bundled.

[0020]

The present invention will be described in detail below.

FIG. 1 shows an embodiment of dental floss using a yarn composed of a solid yarn and a hollow fiber of the present invention. In FIG. 1, a dental floss 1 comprises a dental floss handle 2, a thread 3 and a pick 4.

The dental floss of the present invention is not limited to the dental floss shown in FIG. 1, but the thread as shown in FIGS. 2 (a) and 2 (b) is detachable (both ends of the thread 13 are passed to the tip of the handle 13). After that, the thread 13 can be attached and detached by winding and fixing it on the button 15) or only the thread of dental floss. In the former case, there is an advantage that the thread can be removed from the dental floss handle and replaced with a new thread, or the tension of the thread can be adjusted to one's liking. Further, in the case of the dental floss like the latter, since it is composed only of the thread, by rotating the thread around the tooth and moving the thread up and down, not only the gap between the teeth but also the front surface and / or the back surface of the tooth It is desirable in that it can remove adhered food waste and plaque at the same time.

Further, the arrangement relationship between the solid fiber and the hollow fiber used in the present invention is not particularly limited. For example, a large number of hollow fibers 6 are arranged on the outer periphery of the yarn 3 ', and a large number of solid yarns 7 are arranged on the inner side, and the hollow fibers 6 and the solid yarns 7 are adhered to each other by a sizing agent 8 (FIG.
(A)) A large number of solid yarns 7 are arranged on the outer circumference of the yarn 3 ', and a large number of hollow yarns 6 are arranged on the inner side, and the solid yarns 7 and the hollow fibers 6 are adhered to each other by a paste 8 ( FIG. 3 (b)), in which substantially the same number of solid threads and hollow fibers are arranged on the outer circumference and the inner circumference, and these are adhered to each other by a paste, and the solid thread and the hollow fiber use a paste. For example, an appropriate number of pieces may be bundled. Among these, in which a large number of hollow fibers are arranged on the outer peripheral portion and a large number of solid fibers are arranged on the inner side, when the hollow fiber is a porous membrane, any dentifrice is pre-filled in the inner space of the hollow fiber. As a result, the dentifrice can be effectively removed from the surface of the tooth and the plaque on the tooth gap between the teeth, which is preferable. Further, a large number of solid yarns arranged on the outer peripheral portion and a large number of hollow fibers arranged on the inner side are preferable in terms of durability because the yarns themselves can have sufficient fiber strength.

The sizing agent used in the present invention is not particularly limited as long as it is a solid fiber, a hollow fiber and a solid fiber and a hollow fiber that are adhered to each other and have no toxicity. , Sodium alginate, propylene glycol alginate, casein, sodium caseinate,
Specific examples thereof include sodium fibrin glycolate (CMC), calcium fibrin glycolate, sodium starch glycolate, sodium starch phosphate ester, methyl cellulose, sodium polyacrylate and the like. Moreover, these sizing agents may be used alone or in combination with other sizing agents. Further, the total amount of the sizing agent used is 5% or less, preferably 0.05 to 2% of the total volume of the solid yarn and the hollow fiber.

The material of the solid or hollow fiber used for the dental floss yarn of the present invention is not particularly limited, but examples thereof include aromatic polysulfone, aromatic polyamide, carbonate-ethylene oxide copolymer. ,
Nylon 6, Nylon 11, Nylon 12, Nylon 6
6, nylon 68, nylon 610, nylon 613,
Polyamide such as nylon 7, nylon 8, nylon 9, nylon 13 or nylon 13,13, acrylonitrile-butadiene-styrene copolymer resin, acrylonitrile-styrene copolymer resin, ethylene-vinyl acetate copolymer, polycarbonate, polyethylene , Polyethylene terephthalate, polybutylene terephthalate, methacrylic resin, polyacetal, polypropylene, polystyrene, polyvinyl chloride, fluororesin, cellulose acetate, polydimethylcyclosiloxane-polycarbonate block copolymer, acrylonitrile copolymer, regenerated cellulose, polymethacryl Methyl acid, polyacrylonitrile, polysulfone, polyether sulfone, ethylene-vinyl alcohol copolymer and the like can be mentioned. The material of the solid fiber and the material of the hollow fiber may be the same or different.

Next, the outer diameter of the solid thread used in the present invention is not particularly limited, but preferably has sufficient fiber strength and durability to remove plaque on the tooth surface. Therefore, it is usually 0.1 to 100μ.
m, preferably 3 to 60 μm.

Similarly, the outer diameter of the hollow fiber used in the present invention may be such that it does not cause discomfort even if it enters the gap between the teeth, but the tooth surface is preferable. Since it has sufficient fiber strength and durability to remove the plaque, and is flexible to the extent that it does not cause discomfort even when it enters the gap between teeth, it is usually 1 to 300 μm, preferably Is 50 to 200 μm
Is.

Further, the hollowness of the hollow fiber varies depending on its use mode such as utilizing the inner space of the hollow fiber and inserting a dentifrice in advance, but it is usually 10 to 80%, preferably 15 to 10. 65%.

The method for closing the hollow portion at the tip of the hollow fiber is not particularly limited, and for example, after forming the hollow fiber, another hollow state at the tip hollow portion of the hollow fiber may be used. Examples include a method in which a polymer material (for example, nylon) is attached and closed, and molding is performed into an arbitrary shape, or a method in which after forming a hollow fiber, the hollow end of the hollow fiber is heat-welded and closed. .

Next, as the hollow fiber used in the dental floss yarn of the present invention, either a porous membrane having a large number of fine pores or a non-porous membrane having no fine pores is used depending on the intended use. be able to. The method for producing the porous membrane includes, for example, (1) a stretching method: a method for forming a hollow fiber for a porous membrane by subjecting a hollow fiber of a non-porous membrane to a heat treatment, then stretching, and further heat treatment, or (2) Solvent extraction method: When the hollow fiber is molded, the hollow fiber is molded together with a filler and the like,
Examples include a method of forming a hollow fiber of a porous membrane by extracting and separating with a solvent that can dissolve only the filler after molding. By such a method, it is possible to produce a hollow fiber in which the pore size and the opening rate of the fine pores described later are arbitrarily given.

Further, the pore size of the micropores of the hollow fiber of the porous membrane is usually within a suitable range depending on the use mode such as whether or not a dentifrice is inserted into the inner space of the hollow fiber in advance, but it is usually 0.
001 to 3 μm, preferably 0.002 to 0.1 μm. Similarly, the porosity is usually 10 to 80%, preferably 30 to 60%. Here, the porosity refers to the ratio (percentage,%) of the micropore area to the total surface area per unit area of the surface of the porous membrane.

Among the dental floss yarns thus obtained, particularly when the hollow fiber is made of a porous membrane, the inner space of the hollow fiber is preliminarily filled with at least one component of the dentifrice by an appropriate amount. Is something that can be done. Preferably, when the hollow fiber of the dental floss yarn is made of a porous film, at least one component of the dentifrice is diffused to the outside from the fine pores on the side surface of the hollow fiber during brushing. It is preferable because the toothpaste can effectively act both on the side part of the thread to remove gums and plaque, and also to remove food waste and plaque from the tooth surface and the gap between teeth. is there.

The dentifrice to be preliminarily filled in the inner space of the hollow fiber is a combination of the components shown in Table 1 below in consideration of the efficacy thereof, and usually at least one of the components. It contains a component having an effect (for example, prevention of bad breath), and preferably contains a well-balanced blend of components having various effects similar to those of an ordinary dentifrice.

[0034]

[Table 1]

If each ingredient in the above table has an effect, it is marked with a circle, and if there is no effect, it is regarded as a blank.

Next, the ratio of the number of solid fibers and the number of hollow fibers used in the present invention can be arbitrarily determined according to the purpose of use, such as commonly used dental floss, etc. Usually 1: 9 to 8: 2, preferably 2: 8 to
It is 7: 3.

The length of the dental floss yarn consisting of the solid yarn and the hollow fiber, the strength of the dental floss yarn, etc. are not particularly limited and are the same as those used in the conventional dental floss. The range does not matter.

[0038]

EXAMPLES Next, the present invention will be described in more detail with reference to Examples, but it goes without saying that the present invention is not limited to these Examples.

Example 1 FIG. 1 is a schematic view showing an embodiment of dental floss using a yarn composed of a solid yarn and a hollow fiber of the present invention, and FIG. 3 (a) shows the present invention. FIG. 3 is a cross-sectional view of a yarn showing an embodiment of a yarn of dental floss.

In FIGS. 1 and 3A, a dental floss 1 is composed of a dental floss handle 2, a yarn 3 and a pick 4, and the yarn 3 is composed of a hollow fiber 6 and a solid yarn 7. Further, the hollow fiber 6 and the solid thread 7 are adhered by a paste 8. At this time, the solid yarn 4 is made of ultra high-strength polyethylene (outer diameter 15 μm), and the hollow fiber 5 is made of cellulose triacetate porous membrane (pore diameter 0.002 to 0.01 μm, A hollow fiber (pore diameter: 55%) (outer diameter 85 μm, inner diameter 30 μm) was used. As the paste 8, carboxymethyl cellulose (CMC) was used.
Further, 15 and 20 hollow fibers 6 and 20 solid fibers were used, respectively.

Then, using a model of the inside of the mouth which is often seen in dentists, plaque is adhered to the entire tooth contact portion (which has the same composition as the human tooth), and then the model is placed inside the mouth of the person. Under the same environment as above (Temperature about 40 ° C, Humidity 80% or more, glucose 10 ml and saliva 10 ml as nutrients were applied to the tooth surface with a brush and supplied), left for 3 days to culture and grow plaque Let

Using the dental floss obtained above, the tooth on which the plaque proliferated was polished for about 5 minutes on the tooth surface and the tooth-to-tooth gap, and then rinsed with water, and the mouth was thoroughly rinsed. Washed. At this time, even if a thread was put in the gap between the teeth, no feeling of foreign matter or discomfort was felt. In order to observe the appearance of plaque on the tooth surface after brushing, the tooth surface was scratched with a scaler used to remove plaque and tartar, and the components were observed with a microscope to examine the residual state of plaque. According to this, plaque could be removed almost completely on both the tooth surface and the tooth gap portion.

After that, the same test was continued until the dental floss thread was sagged (until the dental floss thread was cut at one or more places), and the durability was examined. It was 10 pieces).

Comparative Example 1 A dental floss was prepared in the same manner as in Example 1 except that the same nylon 6 solid thread as in Example 1 was used in place of the ultra high strength polyethylene hollow fiber. A similar test was conducted. As a result, when a thread was put in the space between the teeth, a slight foreign body sensation or discomfort was felt (corresponding 7 cases out of 10 cases). Also,
As compared with Example 1, the tooth surface, particularly the tooth gap portion, was not able to completely remove plaque as much as the dental floss of Example 1.

After that, the same test was continued, and the dental floss thread was used until it was sagging (until the dental floss thread was cut at one or more places), and the durability was examined. It was 10 pieces).

Example 2 After the inside of the cellulose triacetate hollow fiber used in Example 1 was treated with ethanol, an appropriate amount (3) of dentifrice (containing a bad breath inhibitor zeolite) was previously prepared in the inner space of the hollow fiber. .2
g) Dental floss was produced in the same manner as in Example 1 except that it was inserted, and the same test was performed. Test results,
When I put the thread in the space between the teeth, I didn't feel any foreign matter or discomfort. Also, plaque could be removed almost completely on both the tooth surface and the tooth gap. In addition, when I breathed in 3 hours after brushing my teeth, there was no foul odor (not applicable in 10 cases) and I was able to remove bad breath enough to achieve the intended purpose as a disposable dental floss. Was confirmed.

After that, the same test was continued, and the durability was examined until the dental floss yarn was sagged (until one or more dental floss yarns were cut). As a result, an average of about 16 times (number of samples) was obtained. 15).

Comparative Example 2 Dental floss made of commercially available nylon 6 solid yarn (3 g of a dentifrice similar to that used in Example 2 was previously applied, the outer diameter was 20 μm, and the fiber strength was the same as in Example 2). About 6
The same test as in Example 1 was performed by using 0% lower). At this time, there was a feeling that the dentifrice remained in the mouth even after gargling, and when a thread was put in the gap between the teeth, a feeling of foreign matter or discomfort was slightly felt. Further, as a result of the test, some plaques could not be removed on the tooth surface, and plaques could not be completely removed even between the teeth. In addition, when 3 hours passed after brushing the teeth, it was possible to judge that there was an odor by sniffing (8 cases out of 10 cases), and it was confirmed that the long-term bad breath prevention effect was not sufficient. .

[0049]

EFFECTS OF THE INVENTION According to the present invention, while maintaining the fiber strength and durability, which are the advantages of the solid floss dental floss yarn, and by additionally using the hollow floss dental floss hair, the solid yarn The plaque can be sufficiently removed without any discomfort even if it enters into a narrow part such as a tooth gap between teeth, which was difficult with only a solid thread, while maintaining the strength and durability of Therefore, an extremely excellent effect can be exhibited in the prevention of tooth decay and periodontal disease.

In particular, as dental floss (including disposable dental floss for one-time use), it is possible to previously fill the hollow inside of the bristles of a hollow fiber brush with a dentifrice selected according to the purpose. Prevents gingivitis, alveolar pyorrhea, prevention of caries development, bleeding prevention, tartar removal, plaque deposition prevention / removal, and / or tobacco debris removal for a long time. Since it can be sufficiently performed and has the same durability as the hair of dental floss made of solid thread, it can sufficiently remove plaque even in narrow areas such as gaps between teeth, and can prevent caries and periodontal disease. It is possible to exhibit an extremely excellent effect for prevention, and it is also possible to obtain an excellent effect as a short-term use form (for example, disposable dental floss).

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of dental floss using a dental floss yarn composed of a solid fiber and a hollow fiber of the present invention.

2 (a) and 2 (b) are schematic views showing another embodiment of a dental floss using a dental floss yarn composed of the solid yarn and the hollow fiber of the present invention.

3 (a) and 3 (b) are views showing a cross section of a dental floss yarn of the present invention.

[Explanation of symbols]

 1, 11 ... Dental floss 2, 12 ... Dental floss handle 3, 3 ', 13 ... Dental floss thread 4 ... Pick 6 ... Hollow thread 7 ... Solid thread 8 ... Adhesive 15 ... Button

Claims (10)

[Claims] 1. A dental floss characterized in that the yarn of the dental floss comprises a solid yarn and a hollow fiber. 2. The dental floss according to claim 1, wherein the hollow fiber has an outer diameter of 1 to 300 μm and a hollow ratio of 10 to 80%. 3. The dental floss according to claim 1, wherein the hollow fiber is a porous membrane. 4. The dental floss according to claim 1, wherein the hollow fiber is a non-porous membrane. 5. The dental floss according to any one of claims 1 to 4, wherein a dentifrice is previously inserted into the hollow inside of the hollow fiber. 6. The dental floss according to any one of claims 1 to 4, wherein at least one component of a dentifrice is previously inserted into the hollow inside of the hollow fiber. 7. The dental floss according to claim 1, wherein the ratio of the numbers of the solid fibers and the hollow fibers used is 1: 9 to 8: 2. 8. When a suitable number of the solid yarns and hollow fibers are adhered to each other in the yarn, the solid yarns are often arranged on the outer periphery of the yarn, and the hollow fibers are included in the yarn. The dental floss according to any one of claims 1 to 7, which is disposed in a large number around the circumference. 9. When the number of the solid fibers and the number of the hollow fibers of the yarn are adhered to each other in an appropriate number, the hollow fibers are often arranged on the outer periphery of the yarn, and the solid yarn is the inner portion of the yarn. The dental floss according to any one of claims 1 to 7, which is disposed in a large number around the circumference. 10. The dental floss according to claim 1, wherein the yarn is a bundle of the solid yarn and the hollow fiber.