Anti-Tooth Fairy is the Tooth Fairy's Anti-Fairy opposite. She has yet to have any role or dialogue in an episode, and so far has only appeared in small cameos in Anti-Fairy themed episodes.
Anti-Tooth Fairy makes a brief appearance in The Fairly OddParents: Clash with the Anti-World. Unlike other Anti-Fairies (in the game), she is not colored blue. Instead, she's colored like the original counterpart. While the Tooth Fairy is attractive and takes people's lost teeth and gives them money, Anti-Tooth Fairy is ugly and gives people teeth. It is presumed that she is good at granting kids wishes, unlike the Tooth Fairy. This makes her stand out from other Anti-Fairies, who spread misfortune rather than grant wishes. It is believed that she steals money from children.