The best time to correct teeth is 10- 14 years old. At this age, the deciduous teeth have been completely replaced, and the mandible still has development potential, which is helpful for the normal growth of the corrected teeth. The effect of orthodontics at this stage is better, which can be said to be twice the result with half the effort, but we can still see many adults wearing braces. After long-term persistence and efforts, we can also achieve satisfactory results.