With the improvement of people’s living standards, more and more patients request orthodontic treatment, most parents and children only notice the misalignment of teeth, but do not recognize other aspects of orthodontics that exist at the same time, especially for some bony misalignment can not be detected early, often making the child miss the best time for treatment. Regarding the best age for orthodontic treatment, it also depends on the type of dental malocclusion of the child, which is generally divided into three stages: First, the period of the molar phase (4-5 years old) This period is mainly applicable to the molar jaw (enamel), early orthodontic treatment is conducive to the development of the upper jaw and the prevention of permanent teeth jaw. If the child has bad habits (such as tongue extension, lip biting, etc.), they can also be corrected at this stage to prevent the occurrence of malocclusion. Second, the teething stage (girls: 8-10 years old, boys: 9-12 years old) is suitable for patients with functional malocclusion and bony malocclusion in the early stage due to bad habits, tongue interference and other factors. If you find that your child has bad habits (such as lip biting, tongue extension, forward jaw extension, etc.), abnormal facial shape and abnormal tooth alignment during the teething stage, you should promptly take your child to the hospital for examination and consultation with an orthodontic specialist to determine whether it is a dental, functional or bony malocclusion, and use this to determine the treatment time and treatment plan. If your child has a functional or bony malocclusion, treatment at this stage can make full use of the growth potential of the jaws and achieve the treatment purpose by promoting or inhibiting the growth of the jaws, which is more beneficial to improving the facial shape and function of your child. Third, the constant pressure stage (girls: 11-14 years old, boys: 13-15 years old) Generally common misshaped jaws can be well treated at this stage. In addition, individual serious malocclusion, such as “severe antimandibular” with family history, should be treated by orthognathic surgery after the age of 18 to achieve the desired effect.