The False Teeth is a Sunken Treasure found in the death tunnel. It’s a set of wind-up false teeth.
It is found in the Death Tunnel, one of the most dangerous locations and underwater currents in the map, because it's filled with Mines and Mega Mines, Pink Jellyfish, Volcanic Jets, in the recent update, it also has a Death Mine! It's also 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 better.