Previous studies by the author (1) of stimulated saliva of persons with active dental caries, on one hand, and free from caries, on the other, point to the conclusion that differences, valid in group averages, occur between the two groups in several respects. The caries-free group gave higher mean values for carbon dioxide capacity,2 total calcium, inorganic phosphate, and the percentage of calcium removed after shaking saliva with a preparation of commercial tricalcium phosphate,3 while the group with active caries yielded a higher aver-
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Maxwell Karshan (1939) studied this question.
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