T. Rex Did Not Have a Toothy Grin

The film Jurassic Park, in 1993, showed Tyrannosurus rex with large teeth which were frighteningly visible. This, except for the exaggerated size, reflected the scientific consensus of the time.  

THIS ARTICLE, based on THIS ACADEMIC PAPER, tells us, with a myriad of data, that this is no longer considered to be true. 

The authors have considered the soft tissue of T. rex and other therapod dinosaurs and come to the conclusion that the fearsome beasties had lips. They were more like present day lizards than crocodiles.

But fear-not, they have not become cuddly. Behind those lips and gums were the same formidable, flesh-rending teeth.

The varying faces of Tyrannosaurus rex. The bottom picture is the most accurate, according to new research. Mark P. Witton