A. When is the best time to correct a patient with misalignment? The common social saying is around 12 years old, which is partially correct. It is more accurate to say that most patients are better off in the early stages of permanent dentition, i.e., when they have just finished replacing their teeth. Most of them finish replacing their teeth between the ages of 11 and 14, but nowadays, due to developmental reasons, some children finish replacing their teeth at the age of 9. Therefore, it is not accurate to say that the age is 12 years old. The biggest advantage of treatment at the early stage of permanent teeth is that the teeth move quickly and can take advantage of the growth and development potential to achieve twice the result with half the effort, and the prognosis is stable and long-term results are good. Second, some patients are required to be treated earlier in the molar and mixed dentition period, such as geodontia, bad habits, etc. Third, serious bony malocclusion, such as uncontrollable diastema, small chin, etc., need to be treated by combined orthodontic surgery after adult. Based on the above three points for parents, if they think their child has a problem, the best way is to see a specialist orthodontist to determine how to deal with it. Fourth, strictly speaking, although orthodontics has the most appropriate age, but in fact, there is no age limit. As long as the oral health allows, adults and even the elderly can do it. The rough composition of our patients is about: teenagers and below (<18) 60%; youth (18-25, mainly college students) 20%; other adults (25 -) 10%. There are many elderly people abroad who do orthodontic treatment, and in recent years we have also admitted some elderly people in the clinic.