A figure of modern myth said to give children a small amount of money (or sometimes a present) in exchange for a tooth when it falls out of a child's mouth
The tooth fairy is an imaginary creature. Children are told that if they put a tooth that comes out under their pillow, the tooth fairy will take it away while they are sleeping and leave a coin in its place. A fairy supposed to leave money under a child's pillow in place of a baby tooth that has just fallen out. an imaginary person who children believe comes into their bedroom and leaves them money for teeth which have fallen out