or ‧ tho ‧ don ‧ tics /ˌɔːθəˈdɒntɪks $ ˌɔːrθəˈdɑːn-/ BrE AmE noun [uncountable]
[ Date: 1900-2000 ; Origin: ortho- 'straight' (from Greek ; ⇨ ↑ orthodox ) + Greek odous 'tooth' ]
the skill or job of helping teeth to grow straight when they have not been growing correctly
—orthodontic adjective :
orthodontic treatment