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The problem of dental decay is possibly one of the greatest problems before the people of the civilized world today. Of itself it causes untold suffering. Indirectly, however, the results are many times worse because from the loss of vitality of the teeth which accrues from dental disease, there are secondary effects. Without dental decay in the first place, authorities consider that there would be very little appendicitis, rheumatic fever, and valvular lesions of the heart. Other diseases in this classification are cancer, arthritis, various forms of heart disease, kidney disease, circulatory disease, in fact nearly all of the killers belong in this classification. Now it seems probable  that from the dental profession is coming the first comprehensive understanding as to the cause and prevention of degenerative diseases. In a sense this should not be unexpected since dentists are dealing with degenerative disease most of the time.