An orthodontist is a dental specialist focused on diagnosing, preventing, and treating dental and facial irregularities, primarily through the use of braces, aligners, and other orthodontic appliances. They help correct misaligned teeth and jaws, improving both function and aesthetics. Orthodontists undergo additional training beyond dental school, typically completing a residency in orthodontics. Their work contributes to better oral health and enhanced smiles for patients of all ages.