There are different optimal periods of correction for different malocclusions: A child can consult a professional orthodontist around the age of 4, but treatment does not have to be immediate. During the period of milk teeth dentition (2-6 years old) only treat malocclusions that may interfere with the development of the jaws include anticuspids and bad oral habits. Anti-collision is usually corrected when the patient is 3-4 years old, using a movable orthodontic period, which usually releases the anticollision in 3-6 months, and some of the patients will not have recurrence, but some patients will have recurrence during replacement or early permanent teeth, and need to be closely monitored. Bad oral habits such as sucking the lower lip, biting nails, eating thumbs, etc. need to be taken as soon as they are detected. In the replacement period, such as anticuspension, mandibular retraction, bad habits, etc. still need to be treated early, there are some uneven teeth do not need to rush to the orthodontic treatment. Most malocclusions can be corrected at the beginning of the permanent dentition, at the age of 11-13 years for girls and 12-15 years for boys. This period of permanent teeth completely established, cranial, maxillary, facial still have part of the potential, metabolic function is good, the teeth of the most significant effect of movement, so this period is the orthodontic treatment of the “golden period”. Reasons ① most of the permanent teeth in the mouth have erupted (but the second permanent molar may be erupting, and the third permanent molar has not yet erupted), the dental arch development has been basically completed, so the development of dental irregularities has been basically stereotyped; ② at this age the child’s maxillofacial development is still in the rapid period of growth and development, and orthodontics to a large extent need to take advantage of the maxillofacial growth and development potential to make the teeth to move and alveolar remodeling The efficiency of orthodontic treatment reaches the optimal level; ③ At this time, the child’s psychological development becomes more mature, and begins to pay attention to their own facial aesthetics, and to a certain extent, they have the motivation to take the initiative to ask for orthodontic treatment. Therefore, children at this stage can basically cooperate with the doctor in orthodontic treatment. Due to the complexity of the growth and development of the mouth and jaw and the development of dental malocclusion, the optimal age for orthodontic treatment is not an absolute concept, for example, some serious impact on the normal growth and development of the jaw and face of the malocclusion, such as teeth backbite, severe dental crowding, etc., need to be observed or treated before the age of 12 should begin. For serious bony malocclusion, it is necessary to wait until the full development of maturity (age about 18-20 years old) for orthognathic surgical treatment in order to achieve satisfactory results. Therefore, parents should keep an eye on their children’s dental development and come to our clinic for consultation once any abnormality is detected.