IPA: /ˌɔːrθəˈdɒntɪst/
KK: /ɔrˈθodənˌtɪst/
A dental specialist who focuses on correcting teeth and jaw alignment using braces and other devices.
My sister is seeing an orthodontist to get braces for her crooked teeth.
Orthodontist → It is formed from "ortho-" (from Greek "orthos", meaning straight or correct) and "dontist" (from Greek "odous", meaning tooth). The word refers to a specialist who corrects teeth to make them straight or proper.
Think of 'straight' ('ortho-') and 'tooth' ('dontist') to remember that an orthodontist is someone who makes teeth straight.