When a child has crooked teeth, it is most appropriate to correct them between the ages of 12 and 17. Orthodontic treatment at the age of 12 to 17 years, on the one hand, the milk teeth have been lost, on the other hand, the child’s alveolar bone is not yet fully developed, so it is convenient for orthodontic treatment, orthodontic effect is better. During the period of replacement of permanent teeth and milk teeth, children will be prone to misalignment of teeth. At this time, you can first observe, if it is a mild misalignment of teeth, with the loss of milk teeth, the teeth may be gradually aligned; if the teeth are more serious, you can wait until the child’s milk teeth replacement is complete, that is, about 12 years old, to go to a professional dentist to wear braces to correct. During the period of tooth replacement, children should pay attention to oral hygiene, to avoid tooth decay, and try not to eat too hard food often, so as not to cause damage to the teeth.