baby tooth
US /ˈbeɪ.bi ˌtuːθ/
UK /ˈbeɪ.bi ˌtuːθ/

1.
one of the temporary teeth that a child has before the permanent teeth grow
:
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My daughter lost her first baby tooth today.
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The dentist said his baby teeth are healthy.
one of the temporary teeth that a child has before the permanent teeth grow