To determine the different braces wearing time according to the different types of mis (dentition), as follows: 1, for the baby teeth or replacement teeth and other relatively simple cases, movable braces wearing time is six months to one year. If children are more cooperative, parents are more cooperative, about half a year to correct the wrong (teeth together); if in the case of less cooperation, the basic 1 year or so can be corrected; if there is still no effect later, interventional correction in the period of milk teeth or teeth will be abandoned until the permanent teeth period will be corrected again. 2, for permanent teeth orthodontic treatment. If it is only a simple malocclusion, basically the correction time is about 1 year to 1.5 years; if the crowding is larger or the type of malocclusion is more serious, it may take about 2 years to 2.5 years; 3. For patients with combined orthodontic and orthognathic treatment, the time required is longer than that of simple orthodontic treatment, and the whole process may take about 2.5 years to 3 years.