Braces were a type of medical implement worn by individuals on their teeth.
Behind the scenes
In her final year in the middle school portion of the Jedi academy at the Jedi Temple on Coruscant, Gaiana, one of the Jedi Padawan [sic] training at the school, returned from spring break wearing braces. Though Cronah, a fellow student and school bully, teased her for it, none of the other students made an issue of it. Roan Novachez, her boyfriend, comforted her by telling her that his brother, Davin Novachez, had once had to wear braces.
- Star Wars: Episode I The Phantom Menace (First appearance)