In order to facilitate patients to seek medical treatment and improve the level of oral health care knowledge, we will introduce the knowledge about oral restoration as follows: please refer to the dental defects, intraoral manifestations: different degrees of destruction of dental hard tissues, defects and deformities. Common etiology: caries, trauma, wear and tear, etc. Restoration methods posterior teeth: metal full, inlay, porcelain crown, anterior teeth: plastic crown, porcelain crown, number of visits: 2-4, preparation before restoration, 1. periodontal cleaning: 2. endodontic treatment of pulp and apical inflammation: 3. gingivectomy for hyperplasia tooth loss, intraoral manifestation: loss of part of the teeth in the tooth row (one tooth missing to only one tooth left). Common etiology: dental caries, periodontal disease. Restoration method: Most patients can be restored with removable partial denture (movable denture). Some patients with oral conditions can use fixed prosthesis: metal or porcelain fixed. The number of visits is 2-4 times. Preparation before restoration, 1. periodontal cleaning 2. extraction of unpreserved teeth and waiting for the wound to heal: 3. treatment of dental defects of the relevant teeth: 4. discontinuation of the old denture for one week of tooth loss, intra-oral manifestations: complete loss of upper and lower jaw teeth (no teeth in the mouth). Common etiology: periodontal disease, dental caries. Restoration method: full denture restoration, either domestic plastic teeth or imported plastic teeth, the latter with realistic appearance and better wear resistance. The number of visits is 3-5, the preparation before restoration, 1. bone tip massage after tooth extraction, 2. necessary shape plastic surgery, 3. the old denture is discontinued for a week Note: the number of visits may increase depending on the condition, and does not include the review after wearing teeth; the preparation before restoration varies from person to person, special treatment according to medical advice. Gao Weinuo, Department of Stomatology, Xiyuan Hospital, Chinese Academy of Traditional Chinese Medicine General knowledge about restorative dentistry: You must go to a regular hospital. Illegal practitioners do not have the conditions and technology for restorative dentistry, unreasonable design and poor restorations will only further damage oral health. It is more appropriate to set the tooth 2-3 months after the extraction of the affected tooth, too short a time for poor wound healing and too long a time for displacement of adjacent teeth; fixed restoration can only be done 3 weeks to one month after root treatment in the dental department. The choice of the restoration method is based on the location of the missing teeth, the condition of the remaining teeth, the occlusal relationship, the patient’s age and other factors, and the advice of the doctor should be taken into account. Patients wearing removable partial denture should use and protect the denture according to the instructions, generally the life span of plastic denture is 3-5 years. Patients with a denture should be reviewed every six months to a year in order to identify problems and resolve them in a timely manner.