orthodontics
noun [ U ] medical specialized uk/ˌɔː.θəˈdɒn.tɪks/ us/ˌɔːr.θoʊˈdɑːn.t̬ɪks/
正牙治疗,口腔正畸
the job or activity of correcting the position of teeth and dealing with and preventing problems of the teeth
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