Orthodontics is a relatively mature orthodontic method, and the safety of orthodontics in regular medical institutions is guaranteed. However, a few people may have some sequelae, including loose teeth, root resorption, gum recession, gingivitis and periodontitis. 1. Loose teeth: orthodontic process will move the teeth, the surrounding tissues will be rebuilt, if the orthodontic overcorrection caused by periodontal disease will cause loose teeth. 2. Root resorption: teeth will be affected by external forces due to orthodontic treatment, and compensatory changes may occur, such as the root of the tooth will gradually be absorbed resulting in shorter. 3. Gum recession: In the process of orthodontic treatment, the gums may be stimulated for a long time, which will eventually lead to gum recession. 4. Gingivitis and periodontitis: After orthodontic treatment, you have to wear braces, if you don’t pay attention to oral hygiene, it is very easy to cause oral inflammation, such as gingivitis, periodontitis and so on. After orthodontic treatment, you should follow the doctor’s instructions for oral care, and should consult the doctor in time when complications occur.