The tooth fairy is a fantasy figure of early childhood. The folklore states that when children lose one of their baby teeth, they should place it underneath their pillow and the tooth fairy will visit while they sleep, replacing the lost tooth with a small payment.
The tradition of leaving a tooth under a pillow for the tooth fairy to collect is practiced in various countries in the Anglosphere.
In early Europe, it was a tradition to bury baby teeth that fell out. When a child's sixth tooth falls out, it is a custom for parents to slip a gift or money from the tooth fairy under the child's pillow, but to take the tooth as a reward.
In northern Europe, there was also a tradition of tand-fé or tooth fee, which was paid when a child lost its first tooth. This tradition is recorded in writings as early as the Eddas, which are the earliest written record of Norse and Northern European traditions.
The reward left varies by country, the family's economic status, amounts the child's peers report receiving and other factors. A 2013 survey by Visa Inc. found that American children receive $3.70 per tooth on average.
During the Middle Ages, other superstitions arose surrounding children's teeth. In England, for example, children were instructed to burn their baby teeth in order to save the child from hardship in the afterlife. Children who didn't consign their baby teeth to the fire would spend eternity searching for them in the afterlife. The Vikings, it is said, paid children for their teeth. In the Norse culture, children's teeth and other articles belonging to children were said to bring good luck in battle, and Scandinavian warriors hung children's teeth on a string around their necks. Fear of witches was another reason to bury or burn teeth. In medieval Europe, it was thought that if a witch were to get hold of one's teeth, it could lead to them having total power over him or her.
The modern incarnation of these traditions into an actual tooth fairy has been dated to 1977, 1962, or 1927. However, there is an earlier reference to the tooth fairy in a 1908 "Household Hints" item in the Chicago Daily Tribune:
"Tooth Fairy.
Many a refractory child will allow a loose tooth to be removed if he knows about the tooth fairy. If he takes his little tooth and puts it under the pillow when he goes to bed the tooth fairy will come in the night and take it away, and in its place will leave some little gift. It is a nice plan for mothers to visit the 5 cent counter and lay in a supply of articles to be used on such occasions. Lillian Brown."