So rapid has been the increase of degeneration of the teeth in modern times, that many physiologists have seriously asked the question, “Will the American race become toothless?” To-day, while artificial teeth are manufactured from such a variety of substances and sold at such a variety of prices, it would seem that Americans are becoming a race of “store teeth” men and women. As with all other branches of hygiene, dentistry is now beginning to discover the ideal of _prevention_; recognizing that the sanitary care of the mouth is a more important object that the most cunning imitation of teeth, or the most ingenious masterpieces in bridge and crown work. Under the leadership of a man who will be recognized in the future as a pioneer in the cause of health, Dr. D. D. Smith, of Philadelphia, a large and rapidly growing body of dentists have formed what is termed the Prophylactic School, the development of which will result not merely in the prevention of a great deal of disease of the teeth and mouth, but of all the body. Physicians in general, and even most dentists, have only begun to recognize the part which the mouth plays in the causation of diseases. At the present time, there are, roughly speaking, about 14,000 dentists in the United States, who annually extract twenty million teeth, manufacture and insert three million artificial teeth, and hammer into the cavities of diseased teeth at least three tons of pure gold, to say nothing about the many tons of mercury, tin, and other metals employed in fillings. When the principles of the Prophylactic School spread, it is safe to say that while the importance of the dentist will become even more generally recognized than it is to-day, nevertheless he will pull fewer teeth, and use less gold and other metals. The principle upon which Dr. Smith, and his rapidly growing band of followers, build their work, is an intelligent recognition of the fact that there are in the human mouth to-day, as has been the condition through all the centuries, highly malignant features of general infection and causes of numerous diseases which until now have been wholly unperceived and neglected. The ordinary physician tells his patient to poke out his tongue, when he looks for an index to that patient’s general condition of health, but he does not look above or below or around or about the tongue, where, in a great number of cases he might find not merely the symptoms but the cause of his patient’s ailment. “THE VESTIBULE OF LIFE” To show some of the common mouth conditions that make it almost an ideal medium for bacterial culture, we quote the following paragraph from Dr. Smith, adding the fact that his statement is one with which all up-to-date physicians concur: