The author Terry Pratchett has a slightly different take on tooth fairies. Not only do they exist (despite various sensible people arguing to the contrary), there are at least three of them and, if they can't find the correct change, they have to remove another tooth. They carry pliers for this purpose. One appears in the Discworld novel 'Soul Music', climbing up a ladder, pliers at the ready, because she hasn't got change for a dollar.