The important question are, are cavities on a shipgirls is a thing? I can buy gingivities, but cavities? And considering all of them are pretty girls, they might not need orthodontic treatment at all....You need electric grinders to work on their flesh and bones. Teeth are much harder.
Dental work would probably require diamond friction wheels on Dremel tools.
Dremel tools even sound sort of like dentist drills...