There are many children's books in which a child meets the tooth fairy. One popular children's book that contains this trope is "No Tooth, No Quarter!" by John Buller and Susan Schade, in which a little boy named Walter loses his already lost tooth.
Another popular children's book that contains this trope is "The Tooth Fairy Meets El Raton Perez" by Rene Colato Lainez with illustrations by Tom Lintern, in which the Tooth Fairy encounters El Raton Perez, another children's character who takes children's teeth. A final option is "Scarlet Underpants Meets the Tooth Fairy" by Catherine Muir, in which a little girl who is teased about her name gets some help from the Tooth Fairy.