Tooth Fairy

The modern tooth-fairy tradition as described in the sources is primarily a modern household myth documented in early 20th-century English-language press (an example cited from Chicago, 1908) and consolidated in twentieth-century popular culture; the Spanish/Latin American mouse variant, El Ratoncito Pérez, was popularized by Luis Coloma's 1894 tale written for Alfonso XIII. Sources note medieval European responses to losing teeth (burying or burning teeth to prevent magical misuse) as historical parallels in cultural concern about teeth, but they do not establish a single continuous lineage from those practices to the contemporary tooth-fairy custom.

Sources emphasize there is no single consistent depiction. Popular and scholarly summaries report a wide range of imagined forms — tiny winged humanoids (a 'Tinkerbell-type' fairy with wings and wand), pixies, children with wings, animals such as mice, bats, bears, or rabbits, and various other depictions used in children's books and media. A 1984 study (often cited in summaries of the literature) found that the majority of respondents pictured the tooth fairy as female, though many pictured male or non-gendered forms. The Spanish/Latin American figure El Ratoncito Pérez is consistently conceived as a little mouse in those traditions.

The tradition attributes a single, specific behavioral function rather than supernatural 'powers': the figure visits a sleeping child at night, takes the lost baby tooth placed by the child (commonly under a pillow or on a bedside table), and leaves a small payment or gift in exchange. It operates stealthily and nocturnally and is used by parents as a pedagogic and comforting device—parents encourage the practice to ease children's anxiety about losing teeth and may tell children that the fairy pays more for a 'perfect tooth' to promote dental hygiene. Modern media sometimes adapt the figure into varied narrative roles, but such adaptations are creative reworkings rather than documented elements of the traditional behavior set.