Tyrannosaurus rex
Late Cretaceous
Hell Creek Formation
Harding County, South Dakota, USA

34mm highly worn tooth.

What else do we have to say other than “Tyrannosaurus rex tooth?” There are bigger and rarer theropods but nothing else has the cachet of T. rex. It’s the instant prize of any fossil collection. People who don’t collect fossils want a T. rex tooth. Even the Predator wanted a skull for his collection.