This Daspletosaurus torosus tooth is 75 million years old, from the Judith River Formation in Fergus County, Montana. It consists of two pieces. The larger of which measures 20.0x10.0x4.0mm and is split laterally. The smaller measures 10.9x4.2x3.5mm, it is also spit laterally and has great serrations and a beautiful blue enamel on one side. 

Daspletosaurus torosus Tooth | Real Fossil