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Scientists refer to the vagina dentata that is the hagfish's face as "two pairs of tooth-like rasps on the top of a tongue-like projection." Just to add insult to horror, it turns out that the hagfish doesn't even really need a mouth, considering that it can actually eat with its skin. It generally gets its nutrition from swimming around in putrid waters around decomposing corpses and absorbing the delicious corpse juice through its pores, not needing its 4 rows of fangs at all Hagfish Mouths, Water Creatures, Amazing Teeth, Sea Creatures, Aliens Brain, Aliens Teeth, Pacific Hagfish, Amazing Life, Hagfish Faces
You have to be toting some pretty hardcore weaponry to survive in the Amazon, and the vampire fish is packing a mouth full of knives designed to shank other fish prison-yard style. The teeth are so long -- up to 6 inches -- that it has to sheathe them in a holster built into the front of its face.
Piranhas have triangle-shaped teeth that are razor-sharp. The fish are known as cruel killers. Sometimes they swim in large schools. They may attack a large fish or other animal in the water. The piranhas use their sharp teeth to chop their victim into tiny bits.