“What is the right age for orthodontic treatment, and can it be done for adults?” This is the most important question that many parents and orthodontists want to know and often ask to orthodontists. Generally speaking, the best age for orthodontic treatment for children is at the peak of growth and development of children, boys at the age of 12-14 years old, girls at the age of 11-13 years old, in this period the permanent tooth roots gradually developed and completed, the upper and lower teeth between the bite relationship is also adjusted to complete, can make a clear diagnosis of the type of malocclusion, when the orthodontic treatment, the The treatment is short and effective. However, the best age for orthodontic treatment is different for different malocclusions, especially for some malocclusions that seriously affect the growth and development of the jaws, early detection and timely treatment. For example, we often say that “pocket teeth” or “envelope” can be treated at the age of 3-5 years, and serious jaw recession, serious deep overbite, should be treated early in the tooth replacement period (7-10 years old) Early treatment is necessary to avoid severe bony malocclusion. Thus, surgical treatment can be avoided. Therefore, different malocclusions have different optimal treatment times and cannot be generalized. Parents should regularly take their children to the hospital for checkups and consult with specialists to avoid missing the time for treatment. In addition, the desire and pursuit of beauty is not only the patent of young people, adults are also eager to align the misaligned teeth, improve the incongruent craniofacial relationship, to obtain normal oral function and beautiful appearance. Scholars at home and abroad have done a lot of research work for this purpose, orthodontic treatment is no longer restricted by age, and the maximum age for treatment in our department is 70 years old. At present, orthodontic materials are developing rapidly, especially the application of lingual fixed aligners (brackets placed on the inner side of the teeth, not easily detected) and ceramic brackets (the color of the brackets is similar to the color of the teeth), which greatly meet the requirements of patients in terms of aesthetics; in particular, Invisalign orthodontic treatment is particularly suitable for adult patients with malocclusion who are engaged in special occupations. For adult patients with bony malocclusion, orthodontic treatment alone is often ineffective, and our department has developed combined orthodontic and orthognathic orthognathic treatment techniques with remarkable efficacy, bringing a boon to this group of patients.