Children with misaligned teeth can have MRC functional orthodontic treatment if they have fully erupted when they are in the milk teeth row. Usually the MRC is called a functional trainer and requires the child to wear it and then do muscle function training, which can promote jaw development, promote tooth alignment, and also facilitate the normal eruption of permanent teeth. In the case of malocclusion in the permanent dentition, fixed orthodontic treatment or invisible orthodontic treatment is required. Fixed orthodontic treatment is generally done by wearing steel braces, that is, fixed aligners, and then the treatment of changing the arch wire, which can promote the alignment of teeth, and after doing so must wear retainers, with a longer period of time in order to keep the teeth straight. If you have bad oral habits and need to correct them, you can continue to wear MRC functional trainers to maintain a long time. Now there is also called invisible orthodontic treatment, invisible orthodontic treatment is similar to the use of retainers, able to wear about 60 pairs, and then each pair of regular replacement, according to the direction of the possibility of tooth displacement, and then functional orthodontic treatment, this orthodontic treatment usually has certain benefits, you can wear at any time, but to ensure that a certain wearing length, in addition to the higher cost, the treatment effect is generally the same as fixed orthodontic treatment The results are generally the same as for fixed orthodontics, except for the higher cost.