Theoretically, treatment of malocclusion can be done at all ages, but most malocclusions have their optimal treatment time. However, most of the malocclusions have their optimal treatment time. Clinically, parents often complain that they miss the optimal treatment time because they do not understand it. Shandong University Stomatology Hospital Orthodontics Liu Hong for most patients with malocclusion, orthodontic treatment should be started after the replacement of milk teeth, the general age range of 12 years old, when the body is in the body of the rapid development of youth, the degree and complexity of malocclusion deformity has been basically manifested, and at the same time, the maxillary and mandibular bone and alveolar bone is still a good growth potential, orthodontic treatment has a good response, tooth movement, Alveolar bone remodeling is also relatively rapid, if you can grasp this time for many complex dental, mild bone malocclusion can get good treatment results. Jining City Stomatological Hospital Orthodontic Zhang Jiakun, but there are also many special circumstances. Some malocclusion should be treated early, otherwise it may develop into a serious facial skeletal deformity, increasing the difficulty of future orthodontic treatment. Clinically common anomalies, (commonly known as “parietal”), should be treated as early as possible, the best in the period of milk teeth 3-5 years old for orthodontic treatment, the process of tooth replacement at the age of 8-10 years old is a better time for treatment. We recommend consulting a professional orthodontist as early as possible when you find out that your child has a circumcision deformity. In addition to the need for early treatment, some patients with severe underdevelopment of the lower jaw should also undergo orthodontic treatment as early as possible. Functional induction is carried out one year before the growth spurt to promote the development of the mandible and ensure the coordination of the upper and lower jaws. The timing of treatment for this condition is limited therefore patients often miss the optimal treatment time. The typical treatment time for this type of bony mandibular retraction is 9-11 years old. When the patient has an ambulatory blockage of the teeth, it should be treated as early as possible rather than waiting until the teeth have been replaced. It is common to encounter patients with unilateral non-eruption of maxillary incisors, which should be examined by radiographs as soon as possible, as there is a possibility of ambulatory blockage of teeth. Ambidextrous teeth are prone to cysts that can compress the roots of neighboring teeth and cause unnecessary damage. Therefore, if you find that the opposite side of the tooth has erupted for more than half a year and the tooth on that side has not erupted, you should have a checkup as soon as possible. For some of the severe cases of paronychia, the jaw is overdeveloped, exceeding the limit of orthodontic treatment, it is necessary to choose the orthodontic orthognathic treatment, and the timing of the treatment needs to be pushed back to the end of the basic development. Generally, the time to start orthodontic treatment is 17 years old, and orthognathic surgery is performed at the age of 18 after about one and a half years of treatment. There is no strict age limit for orthodontic treatment, as long as the teeth are healthy, adults can also undergo orthodontic treatment.