This Daspletosaurus torosus tooth, a close relative of Tyrannosaurus rex,  is 76 million years old from the Judith River Formation in Fergus County, Montana. It measures 52.9x25.7x14.9mm and is all original - no restoration. The tooth has a massive wear facet from use during life and a small chip on the tip. The enamel has been fully preserved. 

Daspletosaurus torosus Tooth | Real Fossil