Although there is now good representation of shark-bitten bone in the fossil record. shark-bitten shark teeth are still exceedingly rare. A relatively small number of teeth of the Neogene megatooth shark Otodus megalodon (Otodontidae) preserve surface markings that were made when struck by the serrated cutting edge of another O. megalodon tooth. https://www.ealisboa.com/flash-sale-Santa-Cruz-Surfboard-Recycled-Cotton-great-price/