If the tooth is knocked loose and only the periodontal membrane is damaged, it can be well by itself and observation can be done; if the tooth is loosened more seriously, it is necessary to take measures such as loosening tooth fixation or extraction according to the situation. 1. Observation: If the tooth is knocked loose and only the periodontal membrane is damaged, in this case, the tooth can be well by itself, but let the affected tooth rest in the past two weeks, and don’t use the affected tooth for chewing, so as to facilitate the recovery of the periodontal membrane. 2. Loose tooth fixation: If the tooth loosening degree is relatively large, take dental radiographs without root fracture, it is best to choose loose tooth fixation, depending on the situation, fixed for 4 to 6 weeks, so that the teeth to return to normal before exercising masticatory functions. 3. Extraction: After the tooth is knocked loose, the root of the tooth is fractured, in this case, it is not meaningful to keep the tooth, it is best to extract the tooth, and then choose dental implant restoration or other prosthetic restoration according to the situation later. After the tooth is knocked loose, go to the hospital in time to take a dental apical film, according to the situation to determine the next step in the treatment program.