A process of supplying fluoride to teeth comprising applying to the teeth a source of fluoride ions and an orthophosphoric acid solution having a pH of about 3-4, then neutralizing the pH to about 7 with an aqueous neutralizing solution containing calcium ions and phosphate ions, wherein there is present about a stoichiometric amount of the phosphate ions relative to the calcium ions, the neutralizing solution having a pH of about 7.
This is a continuation of application Ser. No. 633,052 filed Nov. 18, 1975, now abandoned, which is a continuation of Ser. No. 431,946, filed Jan. 9, 1974, now abandoned.
A non-aqueous organic composition for hardening and strengthening fingernails and toenails of human beings comprises a cosmetically acceptable organic vehicle containing a nail strengthening agent in the form of ammonium hexafluorophosphate dissolvable in this vehicle and providing an effective amount of fluoride.
Substituted phenols are converted in high yields to substituted 4,4'-biphenols by reaction with a substituted 4,4'-diphenoquinone. The substituted 4,4'-diphenoquinone reactant is regenerated by oxidation of a portion of the substituted 4,4'-biphenol product.
A composition and method of making aqueous compositions which totally prevents the formation of calcium phosphate crystals, for example hydroxyapatite.
An oral hygiene composition comprises from 0.01 to 2.0% by weight of the composition of a water soluble ionic fluoride, an ionic abrasive material containing metal cations capable of forming a water insoluble fluoride, and between 0.01% and 9% by weight of the composition of a water soluble ionic agent containing the anionic counter ions of the ionic abrasive together with metal cations capable of forming a water soluble fluoride. The composition is useful in reducing or preventing the inactivation of a water soluble ionic fluoride by an ionic abrasive material.
An oral hygiene product especially for inhibiting caries is the form of toothpaste or mouthwash. The product maintains a low fluoride ion concentration in the mouth for longer periods than conventional products by the rapid precipitation of calcium fluoride either in the mouth or immediately prior to use. The product comprises a composition containing calcium ions and a further composition containing fluoride ions. The ion product of the calcium and fluoride ions of the combined product preferably exceeds 3.times.10.sup.-8 mol.sup.3 dm.sup.-9.
