Tooth broken must immediately go to the hospital for examination, choose the regular hospital stomatology or oral and maxillofacial surgery, the doctor will conduct a detailed oral examination, take small dental film, panoramic film or CBCT (cone beam CT), clear whether there is crown fracture, root fracture, need to be treated according to different situations: 1, crown fracture: 1, the dental nerve is not exposed: only the crown fracture nerve is not exposed, can be directly through Resin restoration or veneer restoration can be done; 2. Exposed nerve: When the crown is fractured and the nerve is exposed, if it is a permanent tooth that is not fully developed, choose live pulp preservation treatment, which can allow the tooth to continue to develop and then do root canal treatment after the development is completed. If it is an adult permanent tooth, root canal treatment can be done directly, and full crown restoration can be done after root canal treatment. Second, the root fracture: 1, located in the 1/3 of the root: can temporarily do not do treatment, if loosening, can be loose teeth fixed, later pay attention to the observation; 2, located in the root of the 1/3: the worst prognosis, it is recommended to be extracted as soon as possible after the dental implant restoration; 3, located in the root of the 1/3: can be slowly moved up the fracture line by traction, to reach the gum above the extraction of the fractured part, the remaining part can do Root canal treatment and later full crown restoration.