1.How long is the treatment course with orthodontic braces? Generally speaking, the treatment of malocclusion during the period of milk teeth and replacement teeth takes about one year, and the treatment of permanent teeth takes about 1-2 years. Difficult patients and special cases need longer time, and the treatment is completed with retainers for about 2 years, and a few patients need longer time or even lifelong retention to prevent recurrence.2. What should be paid attention to in orthodontic treatment? Patients wearing orthodontic braces should pay special attention to oral hygiene, morning and evening and after eating must brush their teeth, otherwise it is easy to cause gingivitis, periodontitis, decalcification of the tooth surface and dental caries, can not eat hard, sticky food, etc., in order to avoid damaging the braces. 3, wearing braces after the teeth will hurt every day? The teeth may have mild reactive pain or discomfort after the monthly follow-up of the orthodontic appliances, which usually lasts for 3-5 days and disappears, so it will not affect the normal work and study due to the pain every day.4 Why do we need to wear a retainer after the completion of orthodontic treatment? After the completion of orthodontic removal of aligners, teeth become neat and beautiful, but this is only half of the long march, the next must wear a retainer. Because at this time the teeth in the new position is not stable, must be maintained with the help of retainers to keep the new position of the teeth waiting for alveolar bone remodeling, the general time for one and a half years.