The caries-inhibiting abilities of the following trimetaphosphates, Na3(PO3)3, NaCa(PO3)3·H2O, Na4Mg(PO 3)6·xH2O, and Ca3(P3O 9)2·10H2O, were compared when added at approximately equal phosphorus concentrations to a cariogenic diet for rats. Each of these four compounds was found to be equally capable of inhibiting carious lesions in the occlusal sulci.
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