False (Fake) teeth.

The false teeth is in the lower canal, aka the Death tunnel
The False Teeth is a Sunken Treasure found in the Death Tunnel. It’s a set of wind-up false teeth with plastic toy legs.
Location[]
It is found in the Death Tunnel, one of the most dangerous locations and underwater currents in the map. This area is dangerous because it's filled with many dangers such as Mines and Mega Mines, Pink Jellyfish, Volcanic Jets, and a Death Mine. It's very hard to find and is difficult to obtain unless the shark you are using can eat Mines.
You can get it easily with a Megalodon or bigger and stronger Sharks up to Moby Dick, however and Enemy Leo may spawn so it's best to get there quickly, before he bites you, because even if you survive one bite you won't be able to get out of the tunnel due to scarce food.