1. The Squid That Grew Human Teeth



Have you ever seen a set of human teeth in the mouth of a squid? The Promacthoteuthis sulcus is the squid of your nightmares, hailing from the depths of the ocean. Fortunately, these teeth aren't as frightening as they seem.
 
This squid's choppers are actually lips! Like many cephalopods, the Promacthoteuthis sulcus has a beak, but its unique folded lips cover up this feature. The bottom line? Don't fear these pseudo-teeth; fear the powerful beak that is concealed beneath them. The line below the bottom line? Fear the bends and death by excruciating pressure if you ever see one of these critters, since you will be hundreds of feet under the surface of the water and in complete darkness.

3. The Dragonfish That Grows Teeth On Its Tongue



Don't think you're getting away once the Dragonfish bites you with its teeth – this deep-sea fish, in addition to having sharp teeth in the normal arrangement, has teeth that grow on its tongue!
 
Despite their frightening appearance, these creatures are no bigger than half a foot, so they really pose no threat. (Also, they live in deep waters, so they never attack humans.) The Dragonfish lives in complete darkness and is almost blind, using alternative means to find food and survive in a desolate environment.

5. The Animal With The Most Teeth And The Least Limbs



Snails have the most teeth of any animal, though their teeth aren't the stereotypical “teeth” that we think of. Snails, despite having thousands of teeth, are unable to chew their food. This is because they use radulas, ribbon-like structures filled with teeth, to grind up their food and prepare it for digestion.
 
Over the lifetime of a mollusk, these tiny teeth become blunt, fall out, and are replaced with new, sharper teeth.