Tooth or dare

"There's a fin-tastic new ride at Dregoland, Shark Point's amazing amusement park. It's the most terrifying, dorsal-defying scare fest in the whole wide ocean! And guess what? Whoever loses the most shark teeth in Harry Hammer's class will get to go on the ride before anyone else--and meet superstar wrestler Gregor the Gnasher! Harry and his archnemesis, Rick Reef, are tied for first place, but will Harry pull it off (or out?) and win the contest?"--Dust jacket.