This Daspletosaurus torosus tooth is 76 million years old, from the Judith River Formation in CentralMontana. This tooth has fully preserved enamel and serrations on both sides. There is also a natural groove on the tip of the tooth from teeth erosion. The tooth measures 31.0x16.2x11.4mm and has no restorations. 

Daspletosaurus torosus Tooth | Real Fossil