If the defect is mild, filling treatment can be carried out in the outpatient clinic; if the patient has a more serious defect, abnormal occlusion, and higher requirements for dental aesthetics, restorative treatment can be used, the specific restorative methods are as follows: 1, inlay: is embedded in the crown to repair the defect and function of the restoration, the materials used include metal, ceramic, resin, etc., can extend the service life of the tooth, and less abrasive dental tissue; 2 The crown is a fixed restoration that covers part of the crown surface, and can be divided into open-faced crowns and 3/4 crowns for anterior teeth, 3/4 crowns and 7/8 crowns for posterior teeth, etc. Part of the crown can only be made of metal, so it is less used now; 3, full crowns: including metal full crowns, non-metal full crowns, mixed full crowns, which can be made of cast metal, plastic, porcelain, resin, all-ceramic, etc.; 4, pile crowns, pile crowns: when the affected tooth Looseness more than Ⅰ degree, poorly controlled apical infection, small and curved root canal with bone resorption, infection in the root canal, this restoration method is not recommended.