Tooth Faeries

Tooth Faeries are a mythical creature mentioned in The Menagerie trilogy.

Description
Tooth Faeries were mentioned to have magic that allows them to lead people into delusions, similarly to will-o'-the-wisps.

Dragon on Trial
Brigid Strong, while under the alias of Delia Dantes, briefly mentions that people who claim to have been abducted by aliens usually have a real run-in with a tooth fairy or will-o'-the-wisp.

Trivia

 * Tooth faeries are one of the only creatures not described in Camp Underpaw's Guide to Mythical Creatures, along with barangs, bunyips, elves, enormous talking cockroaches, grindylows, monster spiders, scarabs, vampires, and will-o'-the-wisps.