反是一种常见的儿童牙畸形 ,如不及时治疗 ,将导致患者上颌骨发育不足 ,下颌骨过度前伸 ,出现严重的颅、颌、面畸形 ,给患者心理带来难言的伤害、影响。随着正畸美容常识的宣传 ,很多乳牙反得到及时矫治 ,避免或阻断了严重畸形的发生和发展。但在临床中 ,我们也发现了乳 Anti-defecation is a common children's dental malformations, if not treated, will lead to patients with maxillary hypoplasia, excessive mandibular advance, there is a serious craniofacial, facial deformities, psychological distress to bring to the patient ,influences. With the publicity of common sense of orthodontic beauty, many deciduous teeth have been corrected in time to avoid or block the occurrence and development of serious deformities. But in the clinic, we also found the milk