Orthodontics can bring the beauty of the appearance of the teeth, but also to improve the human bite function, if the gradual orthodontic teeth, the general sequelae and harm is small, will not cause significant damage to teeth and oral health. But if too eager to pursue orthodontic effects, or without regular medical institutions for orthodontics, may cause some of the following sequelae and hazards: 1, tooth pain: as part of the orthodontic need to rely on external forces to change the position of the teeth, teeth between the mobile collision will cause bone remodeling and periodontal soft tissue remodeling, which may affect the dental nerve and cause toothache; 2, root resorption: teeth continue to be affected by external forces The gingival recession: the gums can be over-tightened by the orthodontic process, stimulating the gums for a long time, which may cause gum recession; 4, alveolar bone resorption: the alveolar bone because of forced pressure, can appear alveolar bone resorption, resulting in a reduction in the encapsulation of the teeth; 5, tooth loosening: excessive orthodontic treatment may cause periodontal disease, and in serious cases can lead to the loss of teeth support, which in turn causes teeth loosening, or even fall out; 6, induced oral ulcers: irregular steel wire or invisible aligners and other hard objects, easy to scratch the mucous membrane in the mouth, causing small damage when it may induce oral ulcers; 7, “braces face”: some people after orthodontics, due to the inconvenience of eating Therefore, choose soft food to reduce the discomfort of chewing, in the long run, it is easy to make the chewing muscle atrophy, resulting in sunken cheeks and prominent cheekbones face. In the orthodontic process, more attention needs to be paid to dental cleaning, because wearing aligners may form more hygienic dead ends, so more careful cleaning of the teeth gaps, aligner gaps and other areas is required. Those who use invisible aligners should brush their teeth after the aligners are removed to avoid tooth decay during the orthodontic process.