A broken tooth can be categorized into small cusp defects, broken necks and broken roots according to the damage, which can be improved by filling the defects, root canal treatment and crown restoration. 1. Small cusp defect: only a small part of the front of the tooth is broken, and the dentin is not damaged, so fillings can be used to fill in the missing part. 2. Cervical fracture: If the tooth is broken and the cervical fracture results in dentin damage and pulp exposure, root canal treatment can be carried out to eliminate the potential risk of pulpal infection, and then crown restoration can be carried out to restore masticatory function. 3. Root fracture: when the root of a tooth is fractured due to tooth fracture, the root of the tooth is slightly lower than or parallel to the edge of the gums, the tooth can be exposed through crown lengthening surgery, and then crown restoration treatment can be carried out. Patients with broken teeth should go to the hospital as soon as possible, and ask the doctor for a clear diagnosis and treatment to avoid delaying the treatment.