Orthodontic treatment for twelve year olds is inexpensive, short, and less likely to recur after orthodontic treatment. However, the degree of cooperation is low and it is difficult to maintain oral hygiene. 1. Benefit: twelve-year-old children’s jaws and faces are in the period of growth and development, orthodontic correction can lead to alveolar bone reconstruction as well as the speed of tooth movement, while shortening the time of orthodontic correction, which usually takes only one and a half to two years. 2. Secondly, twelve-year-old orthodontic costs less, because the difficulty of orthodontic correction is less, the teeth move faster, shorter time, compared to the adult bone malocclusion correction costs much lower; Finally, twelve-year-old teeth basically have been replaced, there is no interference in the orthodontic process, and the correction is not easy to recur. 3. Disadvantages: twelve-year-old children in the subjective level of mutual cooperation to be poorer, the child generally will not be active to remove the oral health, and do not pay attention to oral hygiene, do not do dental cleaning to maintain. Often in the orthodontic appliances around the adhesion of food debris, soft dirt, etc., these will cause tooth surface demineralization, the formation of dental caries, periodontitis, etc.. Therefore, twelve years old orthodontic teeth need parents to closely cooperate, urging small children in order to obtain an extreme correction of the actual results.