The common causes of tooth loss are: 1, caries damage to the hard tissues of the teeth, resulting in residual roots, residual crowns and periapical inflammatory lesions, which may eventually lead to the loss and extraction of the affected teeth; 2, periodontal disease, periodontal disease caused by the progressive resorption of alveolar bone, resulting in loose teeth can not be retained; 3, trauma may cause tooth fracture, root fracture, root fracture, etc. need to be extracted; 4, tumors and other jaw bone disorders 5.Surgical treatment may lead to the extraction of the affected teeth and the affected tissues together; 6.Developmental disorders and congenital defects or congenital loss; 7.Developmental disorders may lead to congenital loss of teeth or ambulatory blockage; 8.Rare diseases and genetic diseases lead to congenital loss of teeth. These eight points are the main causes of tooth loss, when these causes occur, go to the regular hospital for timely diagnosis, to clarify the cause of its occurrence in time for restoration.