tooth fairy
Pronunciation:
/tuːθ ˈfɛəɹɪ/noun
Definitions
A figure of modern myth said to give children a small amount of money (or sometimes a present) in exchange for a milk tooth when it falls out of a child's mouth.
Example: Anna was concerned that telling her child about the tooth fairy, Santa Claus, and the Easter Bunny would cause him to believe his mother was a liar later in life.