Various cultures have customs relating to the loss of deciduous teeth. In English-speaking countries, the tooth fairy is a popular childhood fiction that a fairy rewards children when their baby teeth fall out. Children typically place a tooth under their pillow at night. The fairy is said to take the tooth and replace it with money or small gifts while they sleep. In some parts of Australia, Sweden and Norway, the children put the tooth in a glass of water. In medieval Scandinavia there was a similar tradition, surviving to the present day in Iceland, of "tannfé" ('tooth-money'), a gift to a child when it cuts its first tooth. In Nigeria, the Igbo in a similar custom expect a visiting relative or guest to make a gift or donation to an infant upon the visitor's sighting of the infant's deciduous teeth.