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人的一生有两副牙齿:一副在6个月左右开始长出,到2岁半左右出齐,共20个,称乳牙;另一副在6岁左右逐渐替换乳牙,到十八岁左右长齐,共28—32个,称恒牙。由于遗传、疾病、内分泌障碍、营养不良、功能紊乱、不良习惯等因素,影响了牙颌的生长发育,表现出牙齿的错位,排列不齐,医学上简称牙颌畸形。牙颌畸形是一种常见的口腔慢性疾病,破坏了咀嚼、吸收、语言等功能,影响了颌面
A person's life has two teeth: a pair of 6 months or so began to grow, to 2 and a half years or so, a total of 20, said the primary teeth; the other in the 6-year-old gradually replace the deciduous teeth, to eighteen years old Long Qi, a total of 28-32, that permanent teeth. Due to genetic, disease, endocrine disorders, malnutrition, dysfunction, bad habits and other factors, affecting the growth and development of the dentition, showing the dislocation of the teeth, arranged in irregular, referred to as medical dentistry deformity. Orthodontics is a common chronic oral disease, undermining the chewing, absorption, language and other functions, affecting the maxillofacial