Claims
- 1. A method for the fluoridation of teeth utilizing a two component dentifrice system which is free of any water soluble calcium salts comprising the steps of (1) preparing a first dentifrice component containing from about 2.0% to about 2.5% by weight sodium fluoride as the fluoridation source and having a pH of at least about 7.5, and a second fluoride free, dentifrice component containing a source of phosphate ions and an acid in an amount sufficient to maintain the pH in the range of about 2.5 to about 5.0; both dentifrice components containing a siliceous abrasive; (2) maintaining the first and second dentifrice components separate from the other until application to teeth requiring fluoridation; (3) mixing the first and second components together to form a mixture having a pH of from about 4.0 to about 6.0, (4) applying the mixture to the teeth, whereby enhanced availability of fluoride ions to tooth enamel is observed.
- 2. The method of claim 1, wherein the source of phosphate ions is phosphoric acid, sodium phosphate monobasic or a combination thereof.
- 3. The method of claim 1, wherein the first component contains from about 0.1 to about 3.0% by weight sodium fluoride.
- 4. The method of claim 1, wherein the second component contains from about 0.7 to about 4% by weight of an acid phosphate and an acid salt.
- 5. The method of claim 4, wherein the acid phosphate is phosphoric acid and the acid salt is sodium phosphate monobasic.
- 6. The method of claim 1, wherein the pH of the first component is at least about pH 8.0.
- 7. The method of claim 1, wherein the acid is in an amount sufficient to maintain the pH of the second component in the range of about pH 3.5 to about pH 4.5.
- 8. The method of claim 1, wherein the siliceous abrasive is a precipitated amorphous hydrated silica.
- 9. The method of claim 8, wherein the dentifrice composition contains from 10 to 30% in total of the amorphous hydrated silica abrasive.
- 10. The method of claim 9, wherein both components of the dentifrice system each contain 15.35% by weight of the amorphous hydrated silica abrasive.
- 11. The method of claim 1, wherein a surfactant is incorporated in both components of the dentifrice system.
- 12. The method of claim 11, wherein the surfactant incorporated in the first component of the dentifrice system is sodium lauryl sulfate and the surfactant incorporated in the second component of the dentifrice is a condensate of sorbitan esters of fatty acids with ethylene oxide.
Parent Case Info
This is a continuation-in-part of pending prior application Ser. No. 9/067,819, filed Apr. 28, 1998, which application is now pending.
US Referenced Citations (11)
Non-Patent Literature Citations (1)
Entry |
Prencipe et al Chem Tech “Squeezing Out a Better Toothpaste” (cited in (H), Dec. 1995. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09/067819 |
Apr 1998 |
US |
Child |
09/519507 |
|
US |