The clip The Tooth Fairies from Hellboy II: The Golden Army (2008) with Doug Jones, Ron Perlman
Red? We have company.
Come on, Blue, give me something to work with here.
How many of them?
There are no corpses because there are no leftovers.
Have you noticed the floor?
All these things do is eat and eat.
Then poop, and then eat again.
Remind you of anyone?
Damn it, Abe. What are these things?
Oh, they're Tooth Fairies.
No, no. Third century, Black Forest.
Feed mostly on calcium, bones, skin, organs.
But they do go for the teeth first.
Hence the name Tooth Fairies.
I bet you they don't leave money, either.