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Teeth are harder than bone and therefore fossilize more readily than bones.
Many fossilized dinosaur teeth have been found. The number of teeth that dinosaurs had varied widely. Some, like Gallimimus and Ornithomimus , had no teeth. T. rex had 50 to 60 thick, conical teeth. Ornithischians and some prosauropods had varied teeth, but mostly had horny beaks and many blunt, leaf-like cheek teeth for nipping and sometimes chewing tough vegetation.