Orthodontic movement of teeth depends on the response of periodontal tissue to force. When a tooth is stressed, it produces resorption of the alveolar bone on the pressure side and new bone on the traction side. Some people think that I can move teeth faster with early follow-up, but the speed of tooth movement is not proportional to the time, because there is a certain limit to the elastic deformation of alveolar bone, which cannot be accumulated to a certain extent, instead, the desire for speed is not achieved, the speed of tooth movement decreases, resulting in the pressure side to produce alveolar bone necrosis first, and then resorption. Tooth movement has its own laws of the organism, and it generally takes 4-6 weeks for the new bone trabeculae to form. Therefore, orthodontic treatment should be reviewed about once a month.