This is a tooth from a yet to be identified sauropod dinosaur of North Africa. It is a composite tooth made by the original native field collector who attached a tip from one genuine tooth onto the body of another genuine tooth. They are from the same species but the tooth is not naturally this long making it extremely affordable and impressive for a young collector on a budget, or as a teaching aid. This is a common trick we see in many fossil dealer inventories and it is normally not the type of fossil we offer but its invaluable to use as a study specimen to help detect many fossil dinosaur teeth that are sold as 'natural' when they actually have alterations not disclosed, such as this specimen exhibits.
Sauropod fossil dinosaur teeth are rarely discovered in the same fine condition as theropod teeth. Feeding on plant material rather than other struggling dinosaurs, the teeth of herbivorous sauropods were not designed to take punishment like meat-eating dinosaur teeth so their structure is not as durable. The long, peg-like shape of sauropod dinosaur teeth make them vulnerable to damage over time and easy to break apart over millions of years. What this translates to is that plant-eating sauropod dinosaur teeth are seldom found preserved as well as meat-eating dinosaur teeth. Sauropod dinosaur teeth of equal quality, compared to those from a carnivorous dinosaur, are more rare and their absence from the market demonstrates that.