Thirteen teeth are preserved in "Paranthodon", but as they extend to the back of the maxilla there were possibly more in life. The teeth are symmetrical as in stegosaurs except "Chungkingosaurus". Along the base of the tooth crown there is a swelling (cingulum), which is seen in all other known stegosaurid teeth except "Huayangosaurus". The teeth have a middle ridge, with five fewer prominent ridges on either side. This is similar to the size ridges seen on "Kentrosaurus". Like all stegosaurians, the denticles on the teeth are rounded at the tips, in contrast to ankylosaurians. Also, like "Huayangosaurus", but unlike "Kentrosaurus" and "Stegosaurus", "Paranthodon" possesses a prominent buccal margination (a ridge beside the tooth row). "Paranthodon" teeth preserve wear, but wear is absent on most teeth, similar to "Huayangosaurus", meaning it is likely that "Paranthodon" lacked occlusion between teeth.