牙颌畸形,是指牙齿拥挤、错位、颌骨发育异常以及俗称的“暴牙”、“地包天”、“漏风嘴”等,在医学上统称牙颌畸形。引起这种疾病的原因,可分为先天和后天两大类。在后天因素中,除疾病等因素外,口腔不良习惯也是一个重要原因。所谓不良习惯,是指儿童在生长发育时期养成的咬唇、咬文具、啃指甲、吮橡皮奶头、吐舌、伸舌、舐牙、吮指、用口呼 Orthodontics, refers to the crowded teeth, dislocation, abnormal jaw development and commonly known as “tooth”, “Bundian”, “leaky mouth”, etc., in medicine, collectively referred to as deformities. Cause of this disease can be divided into two major categories of innate and acquired. In acquired factors, in addition to diseases and other factors, bad oral habits is also an important reason. The so-called bad habits, refers to the development of children during the growth and development of bite lip, bite stationery, nibbling nails, sucking pacifier, tongue, tongue, fangs, sucking means, with the mouth