The ability of stannous fluoride solutions of varying concentration made up in tap water to decrease enamel solubility was tested on 540 extracted human molars. No deleterious effect attributable to aging of test solutions was noted at any time in the week test period Conversely, protective ability tended to increase with age this being particular true during the first few hours after mixing. At these intervals this protective performance was negatively entreated with ply of the solution.
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