Moral Decay / Meet The Beat Alls - S3-E13
Plot hole: Buttercup knocks out villains' teeth so she can get money from the tooth fairy. This makes no sense whether you believe in the tooth fairy, or not. If you do believe, the tooth fairy only gives you money for your own teeth, and I'm sure would be able to tell whether they're your own teeth or not. If you don't believe, and think it's the parents giving the kids money, then it's the professor who's giving Buttercup the money. You'd think he'd be suspicious about where Buttercup is getting all those teeth, and would question her accordingly.
Answer: This show is a highly stylized satire of superhero tales, and as such there is never an explanation how Townsville is repaired after all the destruction. There is similarly never any real explanation how Metropolis is put back together after Superman fights a bad guy. Powerpuff Girls takes this concept to the extreme to point out the absurdity of mainstream superhero stories.
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