Orthodontics affects the alveolar bone. The degree of impact on the alveolar bone varies from age to age when orthodontic treatment is done. Orthodontics is the use of a variety of different orthodontic devices to correct teeth alignment problems such as large gaps, buck teeth, etc., but also to change the bite and coordination of jaw deformities. The operation process to the teeth in a certain direction for a long time to impose a reasonable force, the teeth are forced to move the process, the alveolar bone will be modified accordingly, adults, periodontal disease patients alveolar bone modification ability is lower, there may be alveolar bone further resorption, the appearance of the teeth of the triangle gap increase and so on. Children are in the period of growth and development, the alveolar bone remodeling ability is higher. During the period of orthodontic treatment, strict attention should be paid to oral hygiene, if there is any discomfort, consult a doctor in time.