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1 The Dental Research Facility, U. S. Naval Training Center, Great Lakes, Ill., and Northwestern University Dental School, Chicago, Ill.
The pH and lactate content of caries-immune plaques have been determined. A correlation of the pH, total lactate, and free lactic acid in caries-active, caries-immune, and Bushmen plaques has been made. On the basis of the minimum pH and maximum lactate found in caries-immune mouths and Bushmen, it is quite likely that pH values of 5.7 or above and 3 mM per kilogram free lactic acid or less are harmless.
Submitted on April 14, 1955
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