Actually there was a Sonic fighting game, though I cannot remember it's name. it was kinda cheesey though.
Listenin'' to the Music, Hearin'' people scream, Sittin'' in the waiting room, readin'' crappy magazines! With a tooth ache, this it pal! Root canal! My molars are impacted, I''m gettin'' gum disease, I''m gonna need some fillings, I''ve got twelve cavities! Can ya help me? Have mercy Doctor please!