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

1.
fée des dents
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.
Ma fille était tellement excitée quand la fée des dents lui a laissé un dollar pour sa première dent perdue.
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Many children believe in the tooth fairy.
Beaucoup d’enfants croient en la fée des dents.