If you found a T. rex tooth still in the rock, you’d be staring at something the size of a banana. The visible crown alone could be 6–8 inches long, with another 4–6 inches of root buried in the jawbone. Cone-shaped, thick at the base, slightly curved, and with tiny serrations down the edges - like a chunky steak knife.
T. rex didn’t use those teeth like a knife, though. The thickness was the point: they were built to crush, not slice. Bite down on a bone, twist, snap. A skinny sharp tooth would have shattered. T. rex teeth could pulverize.
And they kept regrowing. Like a shark, T. rex constantly had new teeth coming up underneath the old ones - so when one wore down or got yanked out fighting prey, another rose into the spot like an escalator.
