From Longman Dictionary of Contemporary Englishorthodonticsor‧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 treatmentOrigin orthodontics (1900-2000) ortho- “straight” (from Greek; → ORTHODOX) + Greek odous “tooth”
