JP7190809B2 - solid denture cleaner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a solid denture cleanser that contains a bleaching agent and a pigment, and that can suppress the fading of the pigment over time in denture washing water when used.

Bacteria, biofilms, and other deposits easily adhere to dentures regardless of whether they are full dentures or partial dentures. It may be a factor that induces oral diseases such as. Therefore, cleaning and keeping dentures clean is essential as part of oral care. Cleaning with a denture cleanser is important because bacteria and stains adhering to dentures cannot be sufficiently removed by cleaning with a brush.

Cleaning of dentures with a denture cleanser is generally carried out by immersing dentures in denture cleaning water prepared by adding a denture cleanser to water. Conventionally, denture cleansers contain surfactants and foaming agents (carbonic acid compound and acid), and when put into water, they exert chemical cleaning power through surface activation and physical cleaning power through foaming action. Designed to increase cleaning efficiency.

Conventionally, denture cleansers have been provided in the form of solid formulations such as tablets, granules, and powders. Various reports have been made on formulation techniques for achieving this (see, for example, Patent Documents 1 and 2).

Japanese Patent Publication No. 2001-505195 Japanese Patent Application Laid-Open No. 2005-112640

A solid denture cleanser generally contains a bleaching agent in order to impart a bleaching action and improve detergency. Further, a solid denture cleansing agent is sometimes mixed with a pigment in order to enhance the visual effect and give a feeling of use and satisfaction by coloring the denture cleansing water at the time of use. However, denture washing water prepared by adding a solid denture cleansing agent containing a common bleaching agent and a pigment to water has the disadvantage that the pigment fades over time in the denture washing water. Such fading of the pigment over time weakens the visual effect and becomes a factor in impairing the sense of use and satisfaction.

Accordingly, an object of the present invention is to solve the above-described problems of the prior art. Specifically, a solid form containing a bleaching agent and a pigment that can suppress the fading of the pigment over time in water for washing dentures during use. to provide a denture cleanser.

As a result of intensive studies in order to solve the above-mentioned problems, the present inventors selected a specific dye in a solid denture cleanser, and combined it with a bleaching agent to achieve It was found that the fading of pigments over time can be effectively suppressed. The present invention has been completed through further studies based on such findings.

That is, the present invention provides inventions in the following aspects.
Section 1. (A) at least one dye selected from the group consisting of azo dyes, xanthene dyes containing no iodine atoms, indigo dyes, triarylmethane dyes, nitroso dyes, and anthraquinone dyes, and (B ) A solid denture cleanser containing a bleaching agent.
Section 2. Item 2. The solid denture cleanser according to item 1, wherein the pigment is contained in a total amount of 0.0001 to 0.1% by weight.
Item 3. Item 3. The solid denture cleanser according to Item 1 or 2, wherein the total amount of the bleaching agent is 40% by weight or less.
Section 4. Any one of Items 1 to 3, wherein the dye is at least one selected from the group consisting of Black No. 401, Red No. 104 (1), Orange No. 201, Blue No. 1, and Green No. 3. A solid denture cleanser as described.
Item 5. Item 5. The solid according to any one of Items 1 to 4, further comprising at least one carbonate compound selected from the group consisting of carbonates, hydrogencarbonates, and double salts of hydrogencarbonates and carbonates, and an acid. Shaped denture cleanser.
Item 6. Item 6. The solid denture cleanser according to any one of Items 1 to 5, further comprising a surfactant.
Item 7. Item 7. The solid denture cleanser according to any one of Items 1 to 6, which is in the form of a tablet.
Item 8. A method for suppressing fading of a pigment in denture washing water prepared by adding a solid denture cleanser containing a pigment and a bleaching agent, comprising:
The solid denture cleanser is (A) selected from the group consisting of azo dyes, xanthene dyes containing no iodine atom, indigo dyes, triarylmethane dyes, nitroso dyes, and anthraquinone dyes. A method for inhibiting fading, which comprises blending at least one dye and (B) a bleaching agent.

The denture cleansing agent of the present invention contains a dye and a bleaching agent, yet suppresses the fading of the dye in the denture cleansing water during use, and can stably maintain the colored state of the denture cleansing water. It is effective and can enhance the feeling of use and satisfaction.

1. Denture Cleansing Agent The denture cleansing agent of the present invention is in a solid form and comprises (A) azo dyes, xanthene dyes containing no iodine atom, indigo dyes, triarylmethane dyes, nitroso dyes, and anthraquinone dyes. It is characterized by containing at least one dye selected from the group consisting of dyes and (B) a bleaching agent. The denture cleanser of the present invention will be described in detail below.

In the present invention, the term "denture cleansing liquid" refers to water into which a solid denture cleanser has been added, and the dissolution of the solid denture cleanser is starting or progressing, and the solid denture cleansing liquid is Any stage of complete dissolution of the agent is included.

(A) Dye The denture cleanser of the present invention is selected from the group consisting of an azo dye, an iodine atom-free xanthene dye, an indigo dye, a triarylmethane dye, a nitroso dye, and an anthraquinone dye. At least one selected (hereinafter sometimes referred to as component (A)) is included. In this way, by selecting a specific pigment and adding it to a solid denture cleanser containing a bleaching agent, it is possible to suppress the fading of the pigment in the denture cleaning water over time.

The pigment used as component (A) is preferably water-soluble because it plays a role in coloring the denture cleaning water.

Azo dyes are dyes having an azo group (-N=N-) as a chromophore. The type of azo dye used in the present invention is not particularly limited. 225, Red No. 227 (first acid magenta), Red No. 501, Red No. 502, Red No. 503, Red No. 504, Red No. 505, Red No. 506, Orange No. 205, Orange No. 402, Yellow No. 4 (Tartrazine), Yellow No. 5 (Sunset Yellow FCF), Yellow No. 402, Yellow No. 406, Yellow No. 407, Brown No. 201, Black No. 401, and the like. Among these azo dyes, Red No. 2, Red No. 102, Red No. 227 and Black No. 401 are preferred.

A xanthene dye is a dye having a xanthene ring in its molecule. The species of the xanthene dye used in the present invention is not particularly limited as long as it does not contain an iodine atom in the molecule. Red No. 104 (1) (Phloxine B), Red No. 106 (Acid Red), Yellow No. 202 (1) (Uranine), Red No. 213 (Rhodamine B), Red No. 218 (Tetrachlorotetrabromofluorescein), Red No. 223, Red No. 230 (1) (Eosin YS), Red No. 230 (2), Red No. 231, Red No. 401, Yellow No. 202 (2), Orange No. 201 (dibromofluorescein), etc. mentioned. Among these xanthene dyes, Red No. 104 (1), Red No. 106, Yellow No. 202 (1), and Orange No. 201 are preferred.

Indigo dyes are dyes having the group --CO--CH.dbd.CH--CO-- as the chromophore. The type of azo dye used in the present invention is not particularly limited, but water-soluble indigo dyes include, for example, Blue No. 2 (indigo carmine, indigo blue).

A triarylmethane dye is a dye having a triarylmethyl group (preferably a triphenylmethyl group). The type of triarylmethane-based dye used in the present invention is not particularly limited. 205, Green No. 3 (Fast Green FCF), Green No. 205, Green No. 402 and the like. Among these triarylmethane dyes, Blue No. 1 and Green No. 3 are preferred.

A nitroso dye is a dye having a nitroso group. The type of nitroso dye used in the present invention is not particularly limited, but water-soluble nitroso dyes include, for example, Green No. 401 (naphthol green).

An anthraquinone dye is a dye having an anthraquinone skeleton. The type of anthraquinone dye used in the present invention is not particularly limited, but examples of water-soluble anthraquinone dyes include Green No. 204 (pyranin conch), Green No. 201 (alizarin cyanine green), Green No. 202, and purple. No. 201 (Alizurin Purple SS), Murasaki No. 401, and the like. Among these anthraquinone dyes, Green No. 204, Green No. 201 and Murasaki No. 201 are preferred.

In the denture cleanser of the present invention, the component (A) is selected from among azo dyes, xanthene dyes containing no iodine atoms, indigo dyes, triarylmethane dyes, nitroso dyes, and anthraquinone dyes. may be selected and used alone, or two or more of these may be used in combination.

Among these dyes, azo dyes, xanthene dyes containing no iodine atoms, and triarylmethane dyes are preferred from the viewpoint of more effectively suppressing fading of the dyes over time in denture washing water. Dyes; More preferably, Black No. 401, Red No. 104 (1), Orange No. 201, Blue No. 1, and Green No. 3 are mentioned.

In the denture cleanser of the present invention, the content of component (A) is not particularly limited, and may be set appropriately according to the coloring effect to be imparted. 0001 to 0.1% by weight, preferably 0.001 to 0.05% by weight.

(B) Bleaching agent The denture cleanser of the present invention contains a bleaching agent (hereinafter sometimes referred to as component (B)). Even if the denture cleansing agent of the present invention contains a bleaching agent, by using the specific dye, it is possible to suppress the fading of the dye in the denture cleaning water over time.

The type of bleaching agent used in the present invention is not particularly limited as long as it is non-toxic and physiologically acceptable, and a wide range of bleaching agents commonly used in denture cleaners can be used.

Examples of bleaching agents include percarbonate, perborate, persulfate, and monopersulfate.

Specific examples of the percarbonate include alkali metal salts of percarbonate such as sodium percarbonate and potassium percarbonate, ammonium percarbonate, and hydrates thereof. Specific examples of perborate include alkali metal salts of perborate such as sodium perborate and potassium perborate, ammonium perborate, and hydrates thereof. Specific examples of persulfates include alkali metal salts of persulfate such as sodium persulfate and potassium persulfate, ammonium persulfate, and hydrates thereof. Specific examples of monopersulfate include alkali metal salts of hydrogen monopersulfate such as sodium hydrogen monopersulfate and potassium hydrogen monopersulfate, ammonium monopersulfate, hydrates thereof, and the like. .

These bleaching agents may be used singly or in combination of two or more. Among these bleaching agents, alkali metal salts of hydrogen monopersulfate and alkali metal salts of perborate are preferred, and potassium hydrogen monopersulfate and sodium perborate are more preferred.

When a bleaching agent is added to the denture cleansing agent of the present invention, the content thereof may be appropriately set within a range in which the desired bleaching action can be exhibited. From this point of view, the total amount of the bleaching agent is 40% by weight or less, preferably 35% by weight or less, and more preferably 33% by weight or less. The content of the bleaching agent in the denture cleansing agent of the present invention is generally 10 to 40% by weight, preferably 10% by weight, in terms of the total amount of the bleaching agent, from the viewpoint of achieving both the effect of suppressing the fading of the pigment in the denture cleaning water and the bleaching action. to 35% by weight, more preferably 10 to 33% by weight, and even more preferably 13 to 33% by weight.

Foaming Agent The denture cleansing agent of the present invention preferably contains a foaming agent in order to provide physical cleaning action by foaming action.

The foaming agent is composed of a carbonate compound and an acid to generate carbon dioxide gas in the denture cleansing liquid.

Examples of the carbonate compound constituting the foaming agent include carbonates, hydrogencarbonates, and double salts of hydrogencarbonates and carbonates. The carbonate is not particularly limited, but examples thereof include alkali metal salts of carbonic acid such as sodium carbonate and potassium carbonate, preferably sodium carbonate. The hydrogencarbonate is not particularly limited, but examples thereof include alkali metal salts of hydrogencarbonate such as sodium hydrogencarbonate (sodium bicarbonate) and potassium hydrogencarbonate, preferably sodium hydrogencarbonate. The double salt of carbonate and hydrogencarbonate is not particularly limited, and examples thereof include sodium sesquicarbonate. These carbonate compounds may be used singly or in combination of two or more.

Among these carbonate compounds, sodium carbonate and sodium hydrogen carbonate are preferred.

The acid that constitutes the blowing agent is preferably solid at room temperature. Also, the acid may be either an organic acid or an inorganic acid. Examples of organic acids include, but are not limited to, citric acid, tartaric acid, fumaric acid, malic acid, maleic acid, gluconic acid, succinic acid, and salicylic acid. Examples of inorganic acids include, but are not limited to, phosphoric acid and sulfamic acid. These acids may be used singly or in combination of two or more.

Among these acids, organic acids are preferred, and citric acid and malic acid are more preferred.

The ratio of the carbonate and the acid is not particularly limited as long as it can react with the carbonate compound in water to generate carbon dioxide. parts, preferably 30 to 90 parts by weight, more preferably 40 to 85 parts by weight.

When the denture cleansing agent of the present invention contains a foaming agent, its content (the sum of the content of the carbonate compound and the content of the acid) may be appropriately set according to the foaming action to be imparted. For example, 10 to 70% by weight, preferably 20 to 60% by weight, more preferably 30 to 50% by weight.

Surfactant The denture cleanser of the present invention preferably contains a foaming agent in order to provide chemical detergency due to surface activation.

The type of surfactant to be incorporated in the denture cleanser of the present invention is not particularly limited as long as it can be used as a component of the cleanser. Any of the active agents may be used.

Specific examples of cationic surfactants include quaternary ammonium salts such as alkyl (C6-C20) trimethylammonium salts, dialkyl (C6-C20) dimethylammonium salts, and alkyl (C6-C20) dimethylbenzylammonium salts. salts, alkyl (C6-C20) amine salts, alkyl (C6-C20) amine ethylene oxide adducts, alkylpyridinium salts and the like. These cationic surfactants may be used singly or in combination of two or more.

Specific examples of anionic surfactants include linear alkylbenzene sulfonates having an alkyl group having an average of 10 to 16 carbon atoms, alkenyl sulfonates having an average of 10 to 20 carbon atoms in one molecule, an average Linear alkylsulfoacetate having an alkyl group of 10 to 20 carbon atoms, alkyl sulfate having an alkyl group of an average of 10 to 20 carbon atoms, alkanesulfonate having an average of 10 to 20 carbon atoms in one molecule, etc. is mentioned. These anionic surfactants may be used singly or in combination of two or more.

Specific examples of nonionic surfactants include alkyl glycosides, higher alcohol ethylene oxide adducts, alkylphenol ethylene oxide adducts, fatty acid ethylene oxide adducts, polyhydric alcohol fatty acid ester ethylene oxide adducts, and higher alkylamine ethylenes. Polyethylene glycol type surfactants such as oxide adducts, fatty acid amide ethylene oxide adducts, fat ethylene oxide adducts and polypropylene glycol ethylene oxide adducts, fatty acid esters of glycerol, fatty acid esters of pentaerythritol, fatty acids of sorbitol and sorbitan Polyhydric alcohol type surfactants such as esters, fatty acid esters of sucrose, alkyl ethers of polyhydric alcohols, and fatty acid amides of alkanolamines, and the like are included. These nonionic surfactants may be used singly or in combination of two or more.

Specific examples of amphoteric surfactants include amino acid-type surfactants such as alkylaminopropionate salts having an alkyl group having an average carbon number of 10 to 16 (for example, sodium laurylaminopropionate), an average carbon number of 10 to 16. Alkyldimethylbetaine having an alkyl group of (lauryldimethylbetaine, stearyldimethylbetaine, etc.), betaine-type surfactants such as laurylhydroxyethylbetaine, and the like. These amphoteric surfactants may be used singly or in combination of two or more.

Examples of the salt form of the various surfactants include alkali metal salts such as sodium and potassium, alkaline earth metal salts such as magnesium and calcium, ammonium salts, amine salts, and acid addition salts such as hydrochlorides. mentioned.

These surfactants may be used singly or in combination of two or more.

Among these surfactants, anionic surfactants are preferred.

When a surfactant is contained in the denture cleanser of the present invention, the content may be appropriately set according to the type of surfactant to be used, the detergency to be provided, etc. For example, the total amount is 0.1 to 10% by weight, preferably 0.5 to 5% by weight, more preferably 1 to 4% by weight.

Polyalkylene Glycol The denture cleanser of the present invention may contain polyalkylene glycol in addition to the above ingredients. Polyalkylene glycol plays a role as a binder, and can improve moldability when molded into tablets or granules.

Although the number of carbon atoms in the alkylene group constituting the polyalkylene glycol is not particularly limited, examples thereof include 2 to 4, preferably 2 or 3, more preferably 2. The average number of added moles of alkylenoxide in the polyalkylene glycol is not particularly limited, but is, for example, 100 to 250, preferably 130 to 230, more preferably 160 to 210.

Specific examples of polyalkylene glycol include polyethylene glycol, polypropylene glycol, polybutylene glycol and the like.

These polyalkylene glycols may be used singly or in combination of two or more. Among these polyalkylene glycols, polyethylene glycol is preferred.

When the denture cleanser of the present invention contains polyalkylene glycol, the content is, for example, 0.1 to 2% by weight, preferably 0.5 to 2% by weight, more preferably 0.5 to 1.0% by weight. 5% by weight.

Sugar Alcohol The denture cleanser of the present invention may contain a sugar alcohol in addition to the above components. A sugar alcohol serves as a binder, and can improve moldability when molding into tablets or granules.

The type of sugar alcohol is not particularly limited, but examples include sorbitol, mannitol, xylitol, erythritol and the like.

These sugar alcohols may be used singly or in combination of two or more. Among these sugar alcohols, sorbitol is preferred.

When the denture cleanser of the present invention contains a sugar alcohol, the content is, for example, 1 to 30% by weight, preferably 3 to 20% by weight, more preferably 4 to 15% by weight, in terms of the total amount of sugar alcohols. is mentioned.

Lubricant When the denture cleanser of the present invention is tableted, it preferably contains a lubricant.

The type of lubricant is not particularly limited, but examples include magnesium stearate, calcium stearate, sodium stearyl fumarate, sucrose fatty acid ester, sodium lauryl sulfate, talc, light anhydrous silicic acid, and hydrous silicon dioxide. .

These lubricants may be used singly or in combination of two or more. Among these lubricants, magnesium stearate and calcium stearate are preferred, and magnesium stearate is more preferred.

When the denture cleaner of the present invention contains a lubricant, its content is, for example, 0.01 to 1% by weight, preferably 0.015 to 0.5% by weight, more preferably 0.02 to 0.5% by weight. 0.3% by weight may be mentioned.

Other Components In addition to the components described above, the denture cleanser of the present invention contains other additives as necessary for the purpose of enhancing detergency, imparting disintegration properties, imparting moldability, and the like. may be

Other additives that can be blended in the denture cleanser of the present invention include rust inhibitors, chelating agents, pH adjusters, enzymes, sweeteners, foam stabilizers, preservatives, antibacterial/bactericidal agents, preservatives, binding agents. agents (other than alkylene glycols and sugar alcohols), fillers, excipients, disintegrants and the like.

Form The form of the denture cleanser of the present invention is not particularly limited as long as it is in solid form, and examples thereof include tablets, granules and powders. Among these, the tablet form is preferred from the viewpoint of ease of handling. Preparation into such a form can be carried out by a known molding method. For example, by subjecting a raw material mixture obtained by mixing components (A), (B), and other optional ingredients to a molding process such as tableting or granulation, tablets or granules can be obtained. A denture cleaner is obtained.

When the denture cleansing agent of the present invention is made into tablets, the shape and size thereof may be appropriately set according to the object to be cleaned. It is desirable to set it to a reasonable amount. Specifically, the weight of one tablet of the denture cleanser of the present invention is 1 to 4 g, preferably 2 to 3 g.

Method of use The denture cleanser of the present invention can be used to clean dentures by adding water to prepare a denture cleansing solution and immersing the dentures to be cleaned in the denture cleansing solution. Further, when the denture cleansing agent of the present invention contains a foaming agent and a surfactant, the foaming agent causes foaming in the denture cleansing liquid, causing physical irritation to the dentures and the surface active action of the surfactant. can effectively clean dentures.

The denture cleanser containing the denture cleanser of the present invention is colored by the dissolution of the component (A), and the colored state is stably maintained.

Water used for washing dentures with the denture cleanser of the present invention is not particularly limited, and includes tap water, purified water, physiological saline, and the like.

When washing dentures with the denture cleansing agent of the present invention, the denture cleansing agent of the present invention may be added after immersing the dentures in water, or the denture cleansing agent of the present invention may be added to water to obtain a denture cleansing solution. The denture may be immersed after being in the state of

In cleaning dentures, the ratio of the denture cleanser of the present invention to water is appropriately set according to the composition of the denture cleanser of the present invention, the degree of contamination of the dentures to be cleaned, and the like. The amount of the denture cleanser is generally about 1 to 10 parts by weight, preferably about 1 to 5 parts by weight, per 100 parts by weight of water. More specifically, 100 to 200 ml of water is prepared for one denture cleaning, and 1 to 20 g, preferably 1 to 10 g, of the denture cleaning agent of the present invention is added thereto.

The water temperature for washing dentures should be about 5 to 40°C. In addition, the time for immersing the dentures in the denture cleansing solution is usually about 5 minutes to 12 hours, preferably about 30 minutes to 8 hours.

2. Method for cleaning dentures The method for cleaning dentures of the present invention is a method for cleaning dentures using the denture cleaning agent. That is, the method for washing dentures of the present invention is a method of washing dentures by immersing them in denture washing water containing the denture detergent. Specific embodiments of the method for cleaning dentures of the present invention are as described in the section "1. Denture cleansing agent" above.

3. Method for inhibiting discoloration The method for inhibiting discoloration of the present invention is a method for inhibiting discoloration of a pigment in denture washing water prepared by putting a solid denture cleanser containing a pigment and a bleaching agent into water, the method comprising: (A) at least one dye selected from the group consisting of azo dyes, xanthene dyes containing no iodine atoms, indigo dyes, triarylmethane dyes, nitroso dyes, and anthraquinone dyes; and (B) a bleaching agent. In the method for inhibiting fading of the present invention, the dyes, bleaching agents, other ingredients, the form of the solid denture cleanser, and the like are as described in the section "1. Denture cleanser".

EXAMPLES The present invention will be specifically described below by way of examples, but the present invention is not limited to these examples.

The trade names, compositions, sources of purchase, etc. of main components used in the following test examples and formulation examples are as follows.
Potassium sulfate, potassium hydrogen sulfate, and potassium hydrogen monopersulfate mixture (containing about 43% by weight of potassium hydrogen monopersulfate) : trade name "OXONE" (manufactured by LANXESS Corporation)
Sodium perborate : Product name "SODIUM PERBORATE MONOHYDRAT" (manufactured by BELINKA)
Polyethylene glycol : trade name "PEG6000P" (manufactured by Daiichi Kogyo Co., Ltd.)
Sodium α-olefin sulfonate : trade name “ASCO-90” (manufactured by Aekyung Specialty Chemicals Co. Ltd.)
Sodium lauryl sulfate : trade name “Emal 10PHD” (manufactured by Kao Corporation)

Test Examples Powdery denture cleaners having compositions shown in Tables 1 to 4 were prepared. 2.65 g of each denture cleanser was put into 150 ml of water at 40° C. to prepare a denture cleanser. 15 minutes after the addition of the denture cleanser, the appearance of the denture cleanser was observed, and the degree of discoloration of the pigment was evaluated based on the following criteria.
<Determination criteria for the degree of fading of the pigment>
◯: No discoloration is observed compared to immediately after the denture cleanser was added.
Δ: Color fading was observed as compared with immediately after the addition of the denture cleanser, but no loss of color was observed, and the colored state was maintained.
x: Disappearance of color is observed as compared with immediately after application of the denture cleanser.

The results are shown in Tables 1-4. As a result, the denture cleanser prepared using a denture cleanser containing a bleaching agent together with a santene dye, a quinoline dye, a carotenoid dye, or vegetable charcoal containing iodine atoms showed that 15 minutes after the addition of the denture cleanser, The pigment faded significantly and lost its color (Comparative Examples 1 to 5). On the other hand, azo dyes, xanthene dyes that do not contain iodine atoms, indigo dyes, triarylmethane dyes, nitroso dyes, or anthraquinone dyes are adjusted using a denture cleanser containing a bleaching agent. In the cleaning solution, the discoloration of the pigment was suppressed even 15 minutes after the addition of the denture cleanser, and the colored state was stably maintained (Examples 1 to 18).

Although not shown in Tables 1 to 3, when using Red No. 104 (1), Orange No. 201, Black No. 401, Blue No. 1, or Green No. 3 as a pigment, the denture cleanser Color fading was suppressed even after 14 hours from the addition, and the colored state could be stably maintained (Examples 1 to 3, 7, 11, 13, and 14). In other words, it was found that when these dyes were used, a remarkably excellent effect of suppressing fading was exhibited. Further, when the denture cleaners of Examples and Comparative Examples were compressed into tablets, no discoloration was observed in the tablet state in any of the Examples and Comparative Examples.

Formulation Examples A raw material mixture having the composition shown in Table 5 was tableted to obtain a tablet-like denture cleanser (2.65 g per tablet). All of these denture cleansing agents could effectively suppress the fading of the pigment over time in the denture cleansing water.

Claims (6)

(A) at least one dye selected from the group consisting of azo dyes, xanthene dyes containing no iodine atoms, indigo dyes, triarylmethane dyes, nitroso dyes, and anthraquinone dyes;
(B) bleach; and
at least one carbonate compound selected from the group consisting of carbonates, hydrogen carbonates, and double salts of hydrogen carbonates and carbonates;
containing an acid and
A solid denture cleanser in the form of a tablet (except when containing an alkyl ether sulfate and/or phosphate anion active agent and when containing laccaic acid ). The solid denture cleanser according to claim 1, wherein the pigment is contained in a total amount of 0.0001 to 0.1% by weight. The solid denture cleanser according to claim 1 or 2, wherein the bleaching agent is contained in a total amount of 40% by weight or less. Any one of claims 1 to 3, wherein the pigment is at least one selected from the group consisting of Black No. 401, Red No. 104 (1), Orange No. 201, Blue No. 1, and Green No. 3. Solid denture cleansing agent according to. The solid denture cleanser according to any one of claims 1 to 4, further comprising a surfactant. A method for suppressing discoloration of a pigment in denture washing water prepared by adding a solid denture cleanser containing a pigment and a bleaching agent, comprising:
In the solid denture cleanser containing the dye and bleach, the dye includes (A) an azo dye, a xanthene dye that does not contain an iodine atom, an indigo dye, a triarylmethane dye, a nitroso dye, and A method for suppressing fading, comprising adding at least one dye selected from the group consisting of anthraquinone dyes.