Caries is a common and frequent disease in human beings. Because of the slow progress of the disease process, in general does not endanger the patient’s life, so it is not easy to get people’s attention. In fact, caries causes great harm to human beings: if the caries hole is not repaired in time, the lesion further develops to the deeper layer, which can infect the pulp tissue and periapical tissue inside the tooth and cause pulpitis, periapical inflammation and osteomyelitis of the jaw bone and other complications, severe pain and tissue destruction, which seriously affects the health of the whole body; progressive destruction of hard tissues of the body of the tooth, which gradually causes the defect of the dental crown, which becomes a residual crown, leading to the loss of teeth, and even the defect and loss of teeth, which leads to the loss of teeth. Even the defect and loss of teeth, not only destroys the integrity of the masticatory organs, but also affects the digestive function of the body; when this destruction occurs in childhood, it can also affect the development of children’s dental and jaw system, so that the quality of human health declines. In addition, caries and its concomitant diseases, such as necrotic pulp, various types of apical periodontitis and pulp, periodontal joint disease can become a focal point, under certain conditions can cause a focal point of infection in remote organs.