1.It can reduce the risk of dental trauma, because the protruding teeth are more likely to be injured. 2.It can reduce the occurrence of tooth decay, because crooked teeth are not easy to clean. 3.It can reduce the occurrence of temporomandibular joint dysfunction syndrome. 4.It can reduce the tooth abrasion caused by bad bite and bad harmony. 5.The correction of abnormal teeth can effectively prevent pronunciation problems. 6.After orthodontic treatment, it can make people healthier and smile more attractive. 7.A beautiful smile makes people more confident and self-respecting.