The so-called food therapy, is through the selection of appropriate food, to develop good eating habits and pay attention to dietary hygiene, to prevent and cure diseases, a kind of therapy to regulate the body. According to Sun Simiao of the Tang Dynasty, “The doctor must first understand the source of the disease and know what it is, and then treat it with food; if the food treatment does not cure it, then order the medicine”! This means that the prevention and treatment of disease should start from the diet, diet is the key to the occurrence of disease, the so-called “disease from the mouth”, of course, all diseases should be divided into priorities, and then choose food therapy or drug therapy, in order to achieve the target, will not delay the disease!