1.What is anterior retrusion? Anterior retrusion, commonly known as “diastema”, is the most common occlusal disorder in children during the period of teething and dentition. It can be caused by bad habits or trauma to the jaws, such as multiple teeth, retained teeth or trauma to the milk teeth, or root lesions of the milk teeth. Whenever possible, the rebound should be corrected as early as possible, usually at the age of 3-4 years when the roots are stable. Early orthodontic treatment can reduce the deformity of facial bones. The anticlinal period can be caused by genetics, bad oral habits, abnormal tooth eruption, etc. 2, the orthodontic treatment method of anterior teeth recoil Bite sled method: applicable to the teeth just erupted stage, recoil jaw shallow or has not yet appeared recoil jaw children. This method is effective for individual teeth recoil, the reason for failure is often the child or parents can not adhere to. Mandibular beveled guide: for children with milk teeth retrusion, anti-coverage is not serious, or wear movable orthodontic appliances lack of fixed teeth, or the child is not cooperative. After the mandibular oblique guide is glued on, it should be checked once a week, and the aligner should be removed promptly after the rebound is lifted. Active jaw pad braces: For children with appropriately cemented abutments and cooperative wearers of active braces. After the aligner is put in, the force should be added every 1-2 weeks for a follow-up visit, usually 4-12 weeks, and the rebound can be released. For children with severe anterior retrusion, mandibular protrusion, and large anti-coverage, they should wear jaw pad braces in conjunction with head emergence and chin pocket braces. It is beneficial to prevent facial deformity.