A dental defect is a defect in the structure of a tooth. The causes of dental defects include external collision, dental caries and malformation of tooth development. Tooth defects in the front of the mouth can affect the aesthetics and need to be repaired in a timely manner; defects in the back of the mouth need to be self-observed, and changes in tooth color should be seen by a doctor in a timely manner. If the tooth defect is more serious, inlay, porcelain and veneer treatment should be carried out, and if necessary, piling treatment should be carried out. In short, tooth defects should be detected and treated early to save time and money.