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Rh to them that they may be preserved to the end of life. The principal cause of decayed teeth, however, is the lack of exercise from which they suffer through persistent insufficient mastication. If they are given the proper use required in order to masticate the food as here suggested, they will immediately begin to improve in condition. The fermentation of foods in the stomach, as evidenced by a foul breath and coated tongue, also has much to do with the decay of the teeth; and upon the recognition and adoption of the habit of proper mastication, these foul conditions will naturally disappear, and the tendency of the teeth to decay from this cause will immediately cease, if the teeth are put in good condition, all decayed parts removed, and filling used where needed.