If you just correct your teeth, such as irregular teeth, you have to wait until the teeth completely erupt. Generally, boys are between 13- 15 years old, and girls are between 1 1- 14 years old. If the child's malocclusion involves bones, such as the ground, the mandible is more prominent. Generally speaking, it can be corrected around 5 years old. If it is a hospital, I recommend Hangzhou Xiaoshan Stomatological Hospital. His doctor is very good.