At the end of their annual convention in Atlantic City last week, U. S. dentists were as ignorant as ever of the cause of decayed teeth. Three explanations went the rounds: dirty mouths, improper food, unbalanced endocrine glands. None or all give the complete answer, according to the most conscientious research minds of the American Dental Association, 10,000 of whose 40,000 members attended the convention.
Humble for this ignorance, dentists pointed with pride to a new method of spotting the first speck of decay. Offered by Dr. James M. Prime of Omaha,...
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