Know your roots.
A prime example of the deep-rooted bone-crushing teeth of Tyrannosaurus rex. These teeth are the working end of T. rex's incredible 5805 kg bite force, the strongest bite force of any land animal.
Various formations, western Canada and USA.
Late Cretaceous, ~68 - 66 Ma.
http://geoscienze.blogspot.it/search/label/Paleontologia
Thats quite a mouth full, pun intended lol ;)
Check out the GeoScienze website to learn more about the skeletons of dinosaurs and much more. Its in Spanish though, but if you can read understand it then you are ahead of the game.