If you're looking to get a dental filling, you should visit a general dentist. However, an orthodontist can also manipulate dental fillings. It's easier to get a filling before you receive braces, but it's still possible to do it with braces already in place. The specialist will have information about the type of filling material being used.
In either case, spacers may be necessary if large fillings are needed. It's important to practice good oral hygiene for both teeth with fillings and those without. To find a board-certified orthodontist in your area, enter your zip code in the box at the top of this page.