During the winter and summer holidays, the orthodontic departments of major hospitals usher in a peak of consultation. Due to problems such as crowded teeth, buck teeth and enameled teeth, orthodontics has become a “must” for many primary and secondary school students during the winter and summer holidays. Orthodontics is the process of applying a certain amount of force to the teeth, and the pressure on the bones will cause resorption, causing the teeth to slowly move inside the bones and eventually grow in a new position. In terms of age, it is better to have your teeth straightened around the age of 12. This is because at this time, the entire dental arch is fully developed, the milk teeth are basically replaced by permanent teeth, and the roots of permanent teeth are also fully developed, and the bite relationship between the upper and lower teeth is well adjusted. 12 years old is exactly the adolescent period, and the child’s jaw and face are still in a period of rapid growth and development. Orthodontics also needs to take advantage of the potential of jaw and facial growth and development to ensure the best efficiency of tooth movement and alveolar bone reconstruction, so as to achieve perfect orthodontic results. Since the growth period of girls is earlier, orthodontics is generally best for girls at the age of 10-12 and for boys at the age of 11-13. However, there are some dental and jaw deformities, such as “bungee”, lip biting, etc. need to be treated at the age of 3-5 years; some dental and jaw deformities should be selected permanent teeth have begun to erupt, that is, 8-10 years old for the appropriate. In many people’s minds, orthodontics is a time-consuming, laborious and painful “systemic project”. Do the following points to help achieve twice the result with half the effort: 1, insist on wearing retainers. Orthodontics after not wearing retainers relapse rate of up to 100%. The first year after the end of orthodontic treatment to wear retainers 24 hours a day; the second year can wear 12 hours a day; two years later, you can gradually shorten the wearing time. 2, to ensure good brushing. Wearing orthodontic appliances if the teeth are not brushed well, easy to cause tooth decay or periodontal tissue inflammation. Brushing method is to brush your teeth after each meal, use a toothbrush with small brush head and soft bristles, and brush your teeth for not less than 5 minutes each time. 3. Pay attention to the eating method. Initially wear aligners about a week to adapt to resume a normal diet. Patients in orthodontics is best to avoid eating some sticky, hard food, such as ribs, toffee, rice cakes, etc., and cut apples into small pieces before eating, etc., to avoid loosening the attachments of the braces due to improper diet.