Which Dinosaur Really Had the Most Teeth? the Record-Holder Shatters Viral Myths
The undisputed record holders for tooth quantity are the duck-billed hadrosaurs of the Late Cretaceous, led by genera such as Edmontosaurus and Corythosaurus. In mature specimens of Edmontosaurus regalis, individual jaws carried between 1,000 and 1,400 active and replacement teeth, with some exceptional specimens approaching 1,600.
This morphology was not a scattered mouthful of loose teeth. Instead, hadrosaurs arranged their dentition into tightly interlocking columns known as a Hadrosaur dental battery. Each quadrant of the skull, two in the upper maxillae and two in the lower dentaries, housed 40 to 60 vertical tooth columns. Each column stacked three to six replacement teeth directly beneath the functioning chewing surface.
As the functional teeth at the grinding surface wore away against grit and cellulose, replacement teeth migrated upward seamlessly. The teeth interlocked with neighboring columns via specialized coronal cementum, forming a continuous, pavement-like grinding slab. Rather than shedding single teeth individually like theropods or modern sharks, the hadrosaur jaw operated as an integrated, self-repairing milling stone.
