The enamel is one of the most important types of malocclusion that should be treated early in all malocclusions. The orthodontic treatment is divided into several stages, as follows: 1. The first stage: generally 3-5 years old, this stage of the child’s mouth has been built jaw, all the milk teeth have basically erupted. If the degree of cooperation is good, early intervention is recommended at this stage. Because most of the dental eruptions at this stage are dominated by dental angles, dental or functional, and relatively few bony problems, it is very critical and necessary to avoid the development of mis(dentition) malformation to more serious through early interruption, the orthodontic treatment time is generally 3-6 months, the effect is more desirable; 2, the second stage: that is, the replacement stage, generally 8-10 years old, at this stage children often have Functional factors, dental factors, some children do not receive timely treatment for early periapical and bony factors, the need to choose the appropriate orthodontic appliance according to the type, and this stage is also the best time for bone remodeling, if there is a bony anti (dentition), be sure not to miss this stage; 3, the third stage: that is, 11-12 years of age after the permanent tooth stage, children’s bone growth and development and bone remodeling is relatively more difficult, mainly through orthodontic treatment to correct the angle of the teeth, some serious bony malocclusion may have to wait until adulthood, the combination of orthodontic and orthognathic treatment.