Classification of tooth fracture According to the direction of tooth fracture: (1) oblique folding type; (2) longitudinal folding type; (3) transverse folding type Tooth fracture is a common disease in stomatology, due to trauma, caries, physiological abrasion and other reasons resulting in a decline in the resistance of dental tissues in the dentition under the action of dental forces and the dentition fracture. Longitudinal fracture of teeth occurs in 63.48% of maxillary and 36.52% of mandibular. This is related to the anatomical shape and physiological function of the upper and lower jaws. The severity of the symptoms of fractured teeth is related to the duration of the disease. Early symptoms are light, such as fractured teeth occurring in 1 to 2 days, early diagnosis and early treatment and restoration, the efficacy is good, and the success rate is high. If the fracture occurs 2 to 4 weeks after the occurrence of the tooth, it can be followed by periapical and periodontitis, affecting the course and effect of treatment. How to repair a fractured tooth The treatment steps are: 1, debridement: remove small fragments and dislodged old fillings; 2, reset: reset the fractured fragments to a complete fit; 3, fixation: the purpose is to ensure that in the process of restorative treatment, including endodontic treatment, restoration preparation, try to fit the restoration process, will not be due to the role of external forces caused by the movement of the tooth piece and again damage to periodontal tissue. 4, choose full crown restoration: all fractured teeth must be diagnosed early, timely restorative treatment, most of which can be saved and function well.