National Tooth Fairy Day is an unofficial holiday celebrated worldwide, with observances occurring on August 22 and sometimes on February 28. This day honors the beloved childhood character associated with the loss of deciduous teeth, commonly known as baby teeth. The tradition of exchanging lost teeth for money or gifts has roots in various cultures, including the Norse custom of tooth fee, which dates back to the 13th century. In some European countries, children place their teeth under their pillows for a small mouse, such as El Ratoncito Pérez in Spain or La Petite Souris in France, to exchange them for a reward. The tooth fairy, primarily popular in English-speaking countries, first appeared in print in a 1908 issue of the Chicago Daily Tribune, and there is no consensus on the character's appearance or gender. Parents often encourage belief in the tooth fairy to help children cope with the distress of losing their teeth. To celebrate, families may prepare for the tooth fairy's visit or engage in activities related to the character, such as reading books or watching movies about her.