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John Oppie McCall, D.D.S.
JAMA. 1938;111(4):338. doi:10.1001/jama.1938.02790300048021.
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To the Editor:—  In The Journal, March 19, appeared an article by Isaac Schour, D.D.S., Ph.D., entitled "Calcium Metabolism and Teeth." Schour first presents an excellent review of experimental work done for the purpose of determining the effect of certain nutritive and endocrine factors on tooth enamel and comments on the views of various workers as to the susceptibility to decay of hypoplastic enamel. He then states his own conclusion that hypoplastic enamel is not susceptible to decay.Schour next discusses tooth calcification in relation to eruption, pointing out that this process is practically complete by the time of eruption. He then presents evidence to show that the tooth after eruption is not a storehouse from which calcium can be withdrawn to satisfy body needs and from this draws the conclusion that, in pregnancy, fetal demands do not cause calcium withdrawal and that for this reason pregnant women's teeth are


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The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
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