orthodontics or·tho·don·tics (ôr'thə-dŏn'tĭks) or or·tho·don·ture (ôr'thə-dŏn'chər)
n.
The dental specialty and practice of preventing and correcting irregularities of the teeth, as by the use of braces. Also called orthodontia.
orthodontist or·tho·don·tist (ôr'thə-dŏn'tĭst)
n.
A person who specializes in orthodontics.