1, most adults suffer from different degrees of periodontitis, moving misaligned teeth in the presence of periodontitis will accelerate alveolar bone resorption, therefore, before orthodontic treatment, you must receive the necessary periodontitis treatment, such as: scaling, subgingival scraping, flap scraping, etc., when the periodontitis is under control before orthodontic treatment. In the whole orthodontic treatment process, but also according to the situation of regular periodontal treatment. 2, orthodontic treatment before the examination, can not be completely found potential or static pulp, periodontal disease, in the process of orthodontic treatment, may cause the lesion active, resulting in pain, pus overflow, tooth loosening and other symptoms, this time must be interrupted orthodontic treatment, to be lesions of the teeth to accept the treatment before you continue to orthodontic. Sometimes even to terminate orthodontic treatment, with the restorative method to solve the problem, such as: using dentures to solve the remaining gap after tooth extraction. 3.Adult alveolar bone is easy to resorb, in order to avoid this situation, adults need to close the extraction gap, sometimes with the help of dental veneers and other restorative methods. 4, orthodontics before the temporomandibular joint dysfunction symptoms, should first ask the arthroscopist consultation. Due to its complex pathogenesis, orthodontics is only one of the means of treatment, and must cooperate with the arthroscopist for treatment. 5, teeth clenching and teeth grinding (including night grinding), is not conducive to periodontal tissue health, will aggravate periodontal inflammation, such symptoms should be told to the doctor in time, to be diagnosed and treated. 6, adult orthodontic also consider the impact of systemic health, if you suffer from rheumatic heart disease, coronary heart disease, hypothyroidism, hyperacidity, diabetes mellitus, arthritis, bleeding disorders, epilepsy and other diseases, first of all, to make these diseases under control. Long-term use of steroids, pregnancy and other groups, should not receive orthodontic treatment. 7, certain patients can not be fully confirmed before receiving orthodontic problems, can be based on the initial diagnosis of orthodontic, and then through the observation of the orthodontic response, a clear diagnosis to determine the final orthodontic plan. 8.Since adult teeth have no growth potential, for deformities caused by mild and moderate skeletal disorders in the craniofacial region, only orthodontic means can be used to move the teeth to disguise some of the deformities in order to improve the appearance of the face and face, but serious developmental deformities of the jaws or those who require thorough improvement of the shape of the face must be treated with orthognathic surgery in order to change the shape and position of the jaws. 9, adult orthodontic treatment is easy to recur, so it is very important to keep after treatment, do not give up halfway.