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1 Department of Chemistry, Indiana University, Bloomington, Ind.
The effectiveness of sodium fluoride and of stannous fluoride in decreasing the solubility of powdered enamel is substantially independent of the pH at which the fluoride is applied to the enamel, as judged from experiments in which the pH ranged from 2.5 to 7.0. This is contrary to certain reports in the literature.1, 2 The reason for the conflicting conclusions is presented.
In accord with other evidence cited, it is shown that stannous fluoride is much more effective than sodium fluoride in preventing powdered enamel from dissolving in acid.
Submitted on June 2, 1951
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