These two days, snowy road slippery, a lot of trauma, the day before yesterday on night duty, encountered a, because of the fall to the upper incisor dislodgement, teeth are complete, wrapped in toilet paper, teeth wipe can also be clean, come in time, but unfortunately, the dislodged teeth are not well protected, the treatment is the teeth re-implantation, the late effect is estimated that will not be too good. So here I would like to talk about the treatment of tooth trauma after the loss of teeth. Dental reimplantation is an effective method of tooth loss, focusing on the timing of implantation, treatment of lost teeth and good fixation. Successful dental reimplantation relies on the periodontium establishing a healthy reattachment with the cementum, but after tooth dislocation, the periodontium remaining on the root is sensitive to dryness, temperature changes, pollution and surgical manipulation outside the oral cavity, resulting in irreversible damage, and it is difficult to obtain reattachment of the normal structure. The incidence of progressive root resorption is 10% for those who are dislocated for less than 30 minutes, 50% for those who are dislocated for 30-60 minutes, and 90% for those who are dislocated for more than 2 hours, so the dislocation time of the tooth is crucial to the success of tooth reimplantation. Generally, the success rate is extremely low for those who have been out of the tooth for more than 2 hours. After the tooth is dislodged, the residual periodontal membrane must be properly protected, and the tooth can be contained in the mouth or placed in saline or milk, and the tooth can be cleaned with saline immediately after receiving the consultation, and the dirt can be removed by swabbing with a cotton ball, and it is important not to scratch the root surface, and then it can be immersed in the antibiotic solution of chloramphenicol or gentamicin for 5 minutes, and then rinsed with saline, and then it can be cleaned up after cleaning up the alveolar fossa, and then it is strived to implant the tooth in the alveolar fossa in the shortest time, and then forcefully push it in to the root side to make the tooth return to its original position. Push in to return the tooth to its original position, choose wire ligation, arch splint and other ways of fixation according to the conditions, usually fixed for 4 weeks.