tooth fairy
US /ˈtuːθ ˌfer.i/
UK /ˈtuːθ ˌfer.i/

1.
fada do dente
a mythical creature who gives children money or a small gift in exchange for a lost baby tooth, which is placed under a pillow
:
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My daughter was so excited when the tooth fairy left her a dollar for her first lost tooth.
Minha filha ficou tão animada quando a fada do dente deixou um dólar para o primeiro dente que ela perdeu.
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Many children believe in the tooth fairy.
Muitas crianças acreditam na fada do dente.