The lower jaws had an enlarged canine-like tooth, opposite a gap in the upper jaw (a 'diastema'). Unlike "Echinodon", there wasn't an enlarged tooth in the upper jaw. A small peg-like tooth was present in front of the canine-like tooth. Replacement teeth were present in the jaws, unlike most other heterodontosaurids. "Fruitadens" was an omnivore. 