Tyrannosauridae is one of the most well-known dinosaur species, Gorgosaurus or Daspletosaurus is also one of the well-known species in the Tyrannosauridae family. The fossil found from the Judith River Formation in Montana, U.S. Teeth length is approximately 2.5 cm. This fossil is completely natural and has not undergone any repairs. The more valuable thing is that the serrations beside the teeth are still there. This fossilized tooth shows signs of being broken and then glued back together.