A Dietary Aspect of Calculus

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Abstract
Intake of water, up to at least 250 ml., has little to no effect on the usual changes in salivary concn. of Ca and phosphate ions. Ingestion of a high concn. of Ca3 (PO4)2 in soln. of approx. 250 ml. results in an increase in the salivary phosphate-ion concn. These concn. changes in the saliva are relatively unimportant in calculus-forming tendency, unless the critical pH of the saliva differs from the actual pH by 1 or more units. If the difference is more than 1 pH unit, then the concn. changes increase the tendency of saliva to deposit calculus.
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