E. Temperament differences Crocodiles have watched humans grow up and understand humans can be food. Alligators don't normally eat people. Since they have been both isolated from humans for all but about 5 or 6 thousand years, they don't really understand we're on the menu, unless we teach them. F. Smiles on their faces Crocodiles have a toothy grin when their mouths are closed. You see both top teeth and bottom teeth.
Alligators have an overbite.
All you see are the top teeth pointing downward. Alligator jaws and skulls are more rounded at the snout. You now officially know everything you never wanted to know about alligators.