By quoting a popular italian movie reviewer on youtube:
“That’s Karma, bitch.”
This is what I want to show to those bastards saying it’s harsh that Tooth punches Pitch in the end.
When he took her fairies, that probably are like children to her, he mocked her. In her most desperate hour, seeing all her fairies and the teeth taken away, he makes fun of her. She’s so furios she takes Bunny’s boomerang, flying straight to Pitch, probably to crack his skull open with it.
She’s merely doing the same thing to him when he’s down and desperate because, in my opinion, Tooth isn’t a nice little fairy with a good heart: she’s a mother getting her revenge.