Dental trauma is divided into periodontal membrane damage, i.e., tooth loosening of different degrees; dental hard tissue damage, i.e., crown loss; tooth dislocation and tooth fracture. Periodontal membrane damage is mainly manifested as tooth loosening, mild loosening can be left untreated, temporarily do not use the affected tooth to chew food, within a week or two can be basically restored to normal. If the tooth is severely loose, ligature fixation and periodontal fixation can be performed, and if there is pulpal necrosis, further root canal treatment can be done at a later stage. Dental hard tissue damage can be treated by repair. If the pulp is leaking, root canal treatment is required and porcelain restoration is performed if necessary. Tooth dislocation is a tooth that is dislodged from its socket by external forces, and can be classified as incomplete or total dislocation. The treatment of tooth dislocation can be based on the principle of tooth preservation. For partial dislocation such as tooth displacement, semi-dislocation or embedded deep, the tooth should be fully reset first and then fixed for two to three weeks. If the tooth has been completely lost, but not long enough to leave the body, the dislocated tooth can be reimplanted. The common methods of fixation for dislocated teeth are arch splinting, metal wire ligation and nylon wire ligation bonding. In older patients with dislocated teeth, the results of treatment may not be ideal. Tooth fracture is divided into crown fracture, root fracture and crown-root joint fracture, crown fracture requires root canal treatment and then pile crown porcelain restoration; root fracture: apical one-third fracture generally does not require endodontic treatment, and fixed measures can be used if necessary. Root one-third fracture, first reset and then fixed; cervical one-third fracture, part of the cases can be used after endodontic treatment pile crown restoration.