Dinosaur teeth are one of the most popular fossils to collect.
Spinosaurus teeth are some of the most common. Deltadromeus teeth are also common (especially at rock shops), but since the head of it has never been found, we can't be sure. Herbivore teeth are less common.The most sought-after and most expensive is the T-rex tooth.
Value varies. Most teeth can be about $9 to $250, while T.rex teeth are $1000 an inch.
Carnivore teeth usually have serrations and are sharp with a pointed tip. Herbivore teeth are blunt and have no serrations.