Heterodontosaurus is one of more popular ornithischian genera thanks to the mixture of teeth in the mouth. Heterodontosaurus had blade-like incisor teeth and chisel-like molar teeth within the mouth for processing food by slicing and grinding respectively. The show stealing features of the mouth however are the large tusks in the anterior (front) of the mouth. The presence of these tusks means that Heterodontosaurus had three separate kinds of teeth within its mouth, something that is very unusual for a dinosaur. The tusks of Heterodontosaurus have been the largest source of confusion for this genus since there are too very good theories that explain their presence. The first is that they were feeding aids that were used like digging tools, such as for the purpose of digging up plant roots and tubers or breaking down the walls of termite mounds. Another theory though is that the tusks may have been only present upon the males, and that the tusks were used for display and possibly in fights between rival males. Unfortunately we cannot yet say for certain which, or possibly even a degree of both is more correct, but we do now know that the large canines were also present in juveniles.