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From Longman Dictionary of Contemporary English
Related topics: Hospital
orthodonticsor‧tho‧don‧tics /ˌɔːθəˈdɒntɪks $ ˌɔːrθəˈdɑːn-/ noun [uncountable]  MHthe skill or job of helping teeth to grow straight when they have not been growing correctlyGRAMMAR: Singular or plural verb?Orthodontics is followed by a singular verb: Orthodontics is a good profession.orthodontic adjective orthodontic treatment
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