Oral composition

Abstract

To provide an oral composition including at least one selected from the group consisting of condensed phosphoric acids and salts thereof, the oral composition being excellent in tooth-whitening effect while suppressing bitterness.SOLUTION: An oral composition of the present disclosure comprises (A) at least one selected from the group consisting of condensed phosphoric acids and salts thereof and (B) carbon powder, wherein a content of component (A) is 0.1 wt.% to 10 wt.%, and a content of component (B) is 0.12 pts.wt. or more per 1 pt.wt. of component (A).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to an oral composition that contains at least one selected from the group consisting of condensed phosphoric acids and salts thereof, and that has an excellent tooth whitening effect and reduced bitterness. [Background technology]

[0002] Known methods for removing stains, which are discolored stains on teeth, include chemical removal methods and physical removal methods.

[0003] Water-soluble polyphosphates are known as components used in the chemical removal methods. For example, Patent Document 1 proposes an oral composition containing (A) a carboxylic acid isopropyl ester and (B) a water-soluble polyphosphate. Furthermore, Patent Document 2 proposes a whitening toothpaste composition containing a water-soluble polyphosphate, an alkyl sulfate, and polyoxyethylene hydrogenated castor oil. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-239135 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-175766 Summary of the Invention [Problem to be solved by the invention]

[0005] However, since condensed phosphoric acid and its salts have a bitter taste, masking and improving the bitter taste is important for encouraging continued use of the oral composition and improving the usability of the oral composition.

[0006] An object of the present disclosure is to provide an oral composition that contains at least one selected from the group consisting of condensed phosphoric acids and salts thereof, and that has excellent tooth whitening effect and reduced bitterness. [Means for solving the problem]

[0007] The present inventors have conducted extensive research to solve the above problems and have found that by incorporating charcoal powder into an oral composition together with at least one selected from the group consisting of condensed phosphoric acid and its salts, not only is an excellent tooth whitening effect achieved but also the bitter taste derived from the condensed phosphoric acid or its salt can be suppressed. The present disclosure was completed based on this finding and through further research.

[0008] That is, the present disclosure provides the inventions of the following aspects. <1> (A) at least one selected from the group consisting of condensed phosphoric acid and salts thereof; and (B) charcoal powder, The content of component (A) is 0.1 to 10% by weight, An oral composition in which the content of component (B) is 0.12 parts by weight or more per part by weight of component (A). <2> The charcoal powder is activated charcoal. <1> The oral composition according to claim 1. <3> The component (A) is at least one selected from the group consisting of metaphosphates and tripolyphosphates. <1> or <2> The oral composition according to claim 1. <4> The oral composition is a liquid dentifrice, a toothpaste, a mouthwash, or a mouth freshener. <1> ~ <3> The oral composition according to any one of the preceding claims. [Effects of the Invention]

[0009] According to the present disclosure, the bitterness caused by the condensed phosphoric acid or its salt can be suppressed by adding a predetermined amount or more of charcoal powder to the oral composition together with at least one selected from the group consisting of condensed phosphoric acid and its salt. Furthermore, since the oral composition of the present disclosure contains at least one selected from the group consisting of condensed phosphoric acid and its salt and charcoal powder, it has excellent effects of removing stains that discolor teeth and inhibiting stain adhesion, and has excellent effects of whitening teeth. DETAILED DESCRIPTION OF THE INVENTION

[0010] In this specification, the notation X to Y regarding a numerical range means that the range is from X to Y.

[0011] 1.Oral composition The oral composition of the present disclosure contains (A) at least one selected from the group consisting of condensed phosphoric acid and its salts (hereinafter sometimes referred to as component (A)), and (B) charcoal powder (hereinafter sometimes referred to as component (B)), characterized in that the content of component (A) is 0.1 to 10 wt % and the content of component (B) is 0.12 parts by weight or more per part by weight of component (A). The oral composition of the present disclosure will be described in detail below.

[0012] [(A) Condensed phosphoric acid and its salts] The oral composition of the present disclosure contains, as component (A), at least one selected from the group consisting of condensed phosphoric acids and salts thereof.

[0013] Condensed phosphoric acids and their salts are components that remove stains, which are tooth discoloration stains, and inhibit their adhesion. Condensed phosphoric acids are not particularly limited as long as they are applicable to the oral cavity, and examples thereof include linear polyphosphates (e.g., pyrophosphoric acid, tripolyphosphoric acid, tetrapolyphosphoric acid, pentapolyphosphoric acid, and hexapolyphosphoric acid), cyclic polyphosphates (e.g., trimetaphosphoric acid, tetrametaphosphoric acid, and hexametaphosphoric acid), and mixtures thereof (commonly referred to as metaphosphoric acid). Condensed phosphates are not particularly limited as long as they are applicable to the oral cavity, and examples thereof include alkali metal salts of the condensed phosphoric acids, such as sodium salts and potassium salts. Condensed phosphoric acids and salts thereof may be used alone or in combination of two or more. Of the exemplified condensed phosphoric acids, metaphosphoric acid and tripolyphosphoric acid are preferred. Of the exemplified condensed phosphates, metaphosphates and tripolyphosphates are preferred, more preferably alkali metal metaphosphates and alkali metal tripolyphosphates, and even more preferably sodium metaphosphate and sodium tripolyphosphate.

[0014] In the oral composition of the present disclosure, the content of component (A) must be 0.1 to 10% by weight, preferably 0.2 to 8% by weight, more preferably 0.3 to 6% by weight, even more preferably 0.5 to 4% by weight, still more preferably 0.6 to 3% by weight, and particularly preferably 0.8 to 2% by weight, in order to impart to the oral composition the effects of removing stains and inhibiting adhesion, while suppressing the bitterness of the oral composition and improving the feel of use of the oral composition.

[0015] [(B) Charcoal powder] The oral composition of the present disclosure contains charcoal powder as component (B).

[0016] When used in combination with component (A), charcoal powder not only improves the tooth whitening effect but also suppresses the bitter taste derived from condensed phosphoric acid or its salt. Charcoal powder also functions as an adsorbent for preventing or treating gingivitis and periodontitis by adsorbing plaque, tartar, bacteria, etc., or for preventing bad breath.

[0017] The charcoal powder used in the present disclosure is not particularly limited as long as it is black charcoal, and examples thereof include activated charcoal, wood charcoal, bamboo charcoal, and bone charcoal. The charcoal powder may be used alone or in combination with two or more types. Of the charcoal powders listed above, activated charcoal is preferred from the viewpoint of further improving the tooth whitening effect when used in combination with component (A) and from the viewpoint of its excellent ability to suppress the bitterness derived from condensed phosphoric acid or a salt thereof.

[0018] The average particle size of the charcoal powder is not particularly limited, but is, for example, 0.1 to 500 μm. From the viewpoint of further improving the tooth whitening effect when used in combination with component (A) and from the viewpoint of excellent suppression of the bitterness derived from condensed phosphoric acid or a salt thereof, it is preferably 0.5 to 100 μm, more preferably 1 to 70 μm, and even more preferably 10 to 50 μm. In the present disclosure, the average particle size (μm) refers to the 50% particle size (D50) in the cumulative particle size distribution on a volume basis, and is measured by a laser diffraction / scattering method using a laser diffraction / scattering particle size distribution analyzer.

[0019] In the oral composition of the present disclosure, the content of component (B) must be 0.12 parts by weight or more per part by weight of component (A) in order to improve the tooth whitening effect when used in combination with component (A) and to effectively suppress the bitterness derived from condensed phosphoric acid or a salt thereof, and is preferably 0.14 parts by weight or more, more preferably 0.16 parts by weight or more, even more preferably 0.18 parts by weight or more, and particularly preferably 0.2 parts by weight or more. There is no particular upper limit for the content of component (B) per part by weight of component (A), but it is usually 10 parts by weight or less, preferably 8 parts by weight or less, more preferably 5 parts by weight or less, and even more preferably 3 parts by weight or less.

[0020] In the oral composition of the present disclosure, the content of component (B) needs to be adjusted depending on the content of component (A), but is typically 0.012 to 10% by weight. From the viewpoint of further improving the tooth whitening effect when used in combination with component (A), effectively suppressing the bitterness derived from condensed phosphoric acid or a salt thereof, and improving the feel of the oral composition when used, the content is preferably 0.02 to 8% by weight, more preferably 0.03 to 6% by weight, even more preferably 0.05 to 5% by weight, still more preferably 0.1 to 4% by weight, and particularly preferably 0.2 to 3% by weight.

[0021] [Surfactants] The oral composition of the present disclosure preferably contains a surfactant.

[0022] The surfactant used in the present disclosure may be any of a nonionic surfactant, an anionic surfactant, a cationic surfactant, and an amphoteric surfactant, as long as it is applicable to the oral cavity.

[0023] Examples of nonionic surfactants include polyoxyethylene hydrogenated castor oil, polyoxyethylene polyoxypropylene alkyl ethers, glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbit fatty acid esters, polyoxyethylene alkyl ethers, and lecithin derivatives.

[0024] Examples of anionic surfactants include sodium polyoxyethylene lauryl ether sulfate, sodium lauryl sulfate, sodium myristyl sulfate, sodium N-lauroyl sarcosinate, sodium N-myristyl sarcosinate, sodium dodecylbenzenesulfonate, hydrogenated coconut fatty acid monoglyceride sodium monosulfate, sodium lauryl sulfoacetate, sodium α-olefin sulfonate, sodium N-palmitoyl glutamate, and sodium N-methyl-N-acyltaurate.

[0025] Examples of cationic surfactants include lauryltrimethylammonium chloride, stearyltrimethylammonium chloride, benzethonium chloride, benzalkonium chloride, and stearyldimethylbenzylammonium chloride.

[0026] Specific examples of amphoteric surfactants include coconut oil fatty acid amidopropyl betaine, lauryl dimethylaminoacetic acid betaine, lauryl dimethylamine oxide, 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolium betaine, N-lauryl diaminoethyl glycine, N-myristyl diaminoethyl glycine, N-alkyl-1-hydroxyethyl imidazoline betaine sodium, and lecithin.

[0027] The surfactant may be used alone or in combination of two or more. Among the surfactants exemplified above, anionic surfactants are preferred, and sodium lauryl sulfate is more preferred.

[0028] In the oral composition of the present disclosure, the content of the surfactant is not particularly limited and may be set appropriately depending on the type of surfactant used, the formulation form and use of the oral composition, etc., but is, for example, 0.1 to 30 wt %, preferably 0.5 to 20 wt %, more preferably 1 to 10 wt %, and even more preferably 1 to 5 wt %.

[0029] [Thickener] The oral composition of the present disclosure preferably contains a thickener.

[0030] Examples of thickeners include organic thickeners such as xanthan gum, sodium alginate, hydroxyethyl cellulose, carrageenan, sodium carboxymethylcellulose, polyvinylpyrrolidone, sodium polyacrylate, and carboxyvinyl polymer; and inorganic thickeners such as thickening silica. The thickeners may be used alone or in combination of two or more. Of the thickeners listed above, organic thickeners are preferred, and xanthan gum is more preferred.

[0031] In the oral composition of the present disclosure, the content of the thickener is not particularly limited and may be set appropriately depending on the type of thickener used, the formulation form and use of the oral composition, etc., but is, for example, 0.1 to 20 wt %, preferably 0.5 to 10 wt %, and more preferably 1 to 8 wt %.

[0032] [water] The oral composition of the present disclosure preferably contains water as a base. The content of water in the oral composition of the present disclosure may be the remainder excluding the added components, and is appropriately set depending on the form of the oral composition, for example, 10 to 99.5% by mass, preferably 15 to 98% by mass, more preferably 20 to 97% by mass, and even more preferably 30 to 96% by mass.

[0033] [Other ingredients] In addition to the components described above, the oral composition of the present disclosure may contain components commonly used in the art depending on the form of the oral composition, as long as the effects of the present invention are not impaired. Examples of components commonly used in the art include preservatives, bactericides, antibacterial agents, anti-inflammatory agents, abrasives, glucosyltransferase (GTase) inhibitors, plaque inhibitors, hypersensitivity inhibitors, anti-tartar agents, tooth strengthening / remineralization agents, local anesthetics, blood circulation promoters, humectants, excipients, alcohols, oils and fats, sweeteners, refreshing agents, fragrances, colorants, deodorizers, and pH adjusters.

[0034] [Dosage form / shape] The dosage form of the oral composition of the present disclosure is not particularly limited as long as it can be applied to the oral cavity, and examples include liquid and semi-solid forms (gel, paste).

[0035] The form of the oral composition of the present disclosure is not particularly limited as long as it can be applied to the oral cavity and remain there for a certain period of time, and examples thereof include oral hygiene agents such as liquid dentifrices, toothpastes, mouthwashes (liquid dentifrices and mouthwashes are sometimes commonly called mouth rinses, mouthwashes, dental rinses, etc.), mouth fresheners (mouth sprays, etc.), oral ointments, etc. Of the above examples, liquid dentifrices, toothpastes, mouthwashes, and mouth fresheners are preferred. [Example]

[0036] The invention of the present disclosure will be explained in more detail below by showing examples, but the present disclosure is not limited to these examples.

[0037] Test Example [Preparation of test solution] Toothpastes were prepared in a conventional manner with the compositions shown in Tables 1 to 4. The average particle size of the activated carbon used was in the range of 10 to 50 μm.

[0038] 〔evaluation〕 The prepared toothpastes were evaluated for bitterness and tooth whiteness by the following methods.

[0039] <Bitterness> Ten subject monitors applied 1g of each toothpaste to a toothbrush and brushed their teeth for 3 minutes. They then rated the bitterness remaining in their mouths immediately after brushing on a 5-point scale using the following criteria. The total score of the 10 subjects was then calculated. (Bitterness evaluation criteria) 5 points: No bitterness was felt at all. 4 points: Almost no bitterness was felt. 3 points: Slightly bitter taste. 2 points: Tasted quite bitter. 1: Tasted very bitter.

[0040] <Teeth whiteness> Ten subject monitors applied 1g of each toothpaste to a toothbrush and brushed their teeth for 3 minutes once a day, in the morning, afternoon, and evening, continuing this for one week. After one week, they rated the whiteness of their teeth on a 5-point scale using the following criteria. The total score of the 10 subjects was then calculated. (Evaluation criteria for tooth whiteness) 5 points: I felt that my teeth had become much whiter. 4 points: I felt that my teeth had become significantly whiter. 3 points: I felt that my teeth had become slightly whiter. 2 points: I felt that the color of my teeth had hardly changed at all. 1 point: I felt that the color of my teeth had not changed at all.

[0041] <Total score> The total score was calculated by adding the scores for bitterness and tooth whiteness. [Table 1]

[0042] [Table 2]

[0043] [Table 3]

[0044] [Table 4]

[0045] As shown in Tables 1 to 4, oral compositions containing 0.12 parts by weight or more of charcoal powder per part by weight of condensed phosphate (Examples 1 to 18) were found to have a superior tooth whitening effect and to be able to effectively suppress bitterness compared to oral compositions containing 0.01 or 0.1 parts by weight of charcoal powder per part by weight of condensed phosphate (Comparative Examples 1 and 2). Furthermore, it was found that the oral composition containing 15% by weight of condensed phosphate (Comparative Example 3) was unable to suppress bitterness even when 0.33 parts by weight of charcoal powder was added per part by weight of condensed phosphate.

[0046] Prescription example Toothpastes were prepared with the compositions shown in Table 5. The average particle size of the activated carbon used was in the range of 10 to 50 μm. All of the toothpastes prepared were excellent in terms of tooth whitening effect, and bitterness was effectively suppressed.

[0047] [Table 5]

Claims

1. (A) at least one selected from the group consisting of condensed phosphoric acid and salts thereof; and (B) charcoal powder, The content of component (A) is 0.1 to 10% by weight, An oral composition in which the content of component (B) is 0.12 parts by weight or more per 1 part by weight of component (A).

2. The oral composition of claim 1 , wherein the charcoal powder is activated charcoal.

3. 2. The oral composition according to claim 1, wherein component (A) is at least one selected from the group consisting of metaphosphates and tripolyphosphates.

4. The oral composition according to any one of claims 1 to 3, wherein the oral composition is a liquid dentifrice, a toothpaste, a mouthwash, or a mouth freshener.

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