Tooth Fairy
From Super-wiki
Dean: What, you--you were a dentist?
Garth: Yeah, just for, like, for a hot minute. Where'd you think I got my first case?
Garth: Yeah, man. I mean, not my proudest moment, but it happened.
Dean: Let me guess--Tooth Fairy.
Garth: Yeah. Man, I felt terrible when I ganked that S.O.B.
Sam: Uh, you killed the Toothy Fairy?
The Tooth Fairy was killed by Garth Fitzgerald IV.
Tooth Fairy in Lore
The Tooth Fairy is a tradition of Anglo origin, whereby the creature will exchange a coin for a child's tooth when it falls out.