Dinosaurs shed their teeth throughout their lives, just like modern sharks do. Because of this, the most common dinosaur fossils are teeth. Teeth are also the hardest substance of a dinosaur skeleton so the teeth are most suited to be preserved when perhaps, the bone would have rotted away and never fossilized.
We can learn much about a dinosaur based on their teeth. The teeth tell us what kind of food they ate, meat or plants. The teeth also tell us HOW the dinosaur ate. If they were a plant-eater and their teeth were long rods that were slightly spaced apart in the jaw, then one can surmise their teeth were best for raking or stripping leaves off of branches as is found in the long-necked sauropods. If they were a plant-eater and their teeth were lined up tightly like long, solid rows of flattened pegs, then those teeth would have been best for crushing up and grinding heavier plant matter as is found in the duck-billed hadrosaurs. Meat-eaters with flattened and curved blade-like teeth would have torn their flesh from their prey as is found in dromaeosaurs (raptors). Meat-eaters that had robust, conical spike-shaped teeth would have fed by grabbing and crushing their prey as is found in the Spinosaur family of dinosaurs.
We sometimes get the question "Are fossil dinosaur teeth really the actual teeth?". Many are under the impression that these fossils are simply solid stone petrified remains of teeth. The answer is YES, they are the real, actual teeth of the dinosaur, not like some other forms of fossils where the object became replaced with stone over time. If you were to cut one in half or worse, drop it, you would see the inner anatomy of the tooth such as the core where the pulp once was near the base, as well as the dentin and outer layer of enamel. As real teeth, they are fragile and can have microscopic fractures on the surface or through the tooth so that if the tooth is bumped, it could easily break. Some interesting scientific studies have been done on dinosaur teeth such as slicing a specimen and studying the growth patterns and molecular structure under high-power magnification. Paleo Direct only sells authentic fossils, never replicas so the specimens you see below are all genuine and come with a certificate of ID, condition and authenticity.