Generally speaking, the appropriate age for orthodontic treatment is 10-16 years old, because children have just finished replacing their teeth and are in a period of vigorous growth and development, when orthodontic treatment can maximize the coordination of the upper and lower jaws and improve facial appearance. However, there are many causes of malocclusion and different manifestations, and the best time for orthodontics varies. For example, the anterior retrusion of the teeth in childhood, which is commonly known as “encephalitis”, should be treated as early as possible, starting as early as 3-5 years old, before serious malocclusion occurs, usually within 2-3 months, which interrupts the development of bone deformity and creates a good environment for bone development, while improving the facial shape and enhancing the child’s self-confidence. For more serious “small chin” deformity or stubborn oral habits, such as finger sucking, tongue spitting, mouth breathing, lip biting and other oral habits, early orthodontic treatment is recommended, if you miss the best time to correct and then correct, not only the technical complexity, the course of treatment growth, and the effect of orthodontic treatment will be greatly reduced, therefore, if parents are not sure whether the child Therefore, if parents are not sure whether their children need to receive orthodontic treatment, they should regularly go to the hospital to consult with the orthodontist to avoid missing the best time for orthodontic treatment.