As society continues to develop and progress, parents want their children to have a healthy and beautiful set of teeth! However, due to the continuous refinement of food structure, the incidence of malocclusion is increasing. A mouth of crooked teeth is not only unattractive, but also easy to form dental caries and periodontal disease due to uneven teeth, unclean brushing and easy to retain food debris, tartar and plaque in between teeth. Therefore, many children with uneven teeth need to do orthodontics, is it better for children to do orthodontics as early as possible? The timing of orthodontic treatment depends on the situation and cannot be generalized. The timing of early orthodontic treatment of malocclusion is very important and should usually be judged by the age of the teeth, the age of the bone and the state of cooperation. The general orthodontic treatment of the milk teeth is best at the age of about 4 years, when the roots of the milk teeth are fully developed and have not begun to resorb, the effect of orthodontic treatment is good. If orthodontic treatment is too early, children often can not cooperate; orthodontic treatment is too late, the milk incisors have begun to resorb, the milk incisors easily fall out when the force. The orthodontic treatment of mixed teeth, such as anterior retrusion, should generally be carried out when the root of permanent incisors is basically developed. Early orthodontic treatment of jaw deformities should be judged according to the whole body bone age and should be performed before and during the growth spurt, generally 1-3 years before the youthful growth spurt, about 10-12 years old (the male spurt is about 2 years later than the female spurt). If the treatment is done too early, the correction is often prone to recurrence due to the jaw growth pattern, which requires long-term observation and maintenance, thus artificially prolonging the treatment time. Finally, it should be emphasized that everyone’s growth and development is different, and it still depends on the actual situation. Parents are advised to take their children to a dental specialist for examination before making a decision and choosing the best treatment timing and plan for the individual.