🦖 T. rex Tooth Discovery! A powerful relic from the king of the Late Cretaceous — the tooth of Tyrannosaurus rex. Built like a crushing blade, T. rex teeth had thick roots and sharp serrations made to break bone and tear flesh. Some grew over 12 inches (30 cm) long, making them among the biggest predator teeth ever found on land. Most T. rex teeth come from Hell Creek–age rocks (around 66 million years old) and often show wear or feeding damage, revealing how this apex hunter attacked and consu