Denture Sharks live in the depths of Bottomsup Bay in Fossil Fighters. They do not have real teeth, and they're not considered a type of Vivosaur. When the Hero firsts visits Bottomsup Bay, he has to get to Rosie. She's unfortunately surrounded by Denture Sharks, making such a simple task a treacherous one. The Hero must safely reach Rosie without being bit by said sharks. In the event that the Hero is bitten, he'll be sent back to the entrance. After he saves Rosie from the ferocious school of Denture Sharks, they disappear, only to reappear again when the Hero has to find a Denture Shark's dentures for Nick Nack.