The hagfish is a slime-emitting ocean-dweller ... and a terrifying pit of a mouth that's lined with rows of razor-sharp teeth. Explore Subscribe Newsletters Content Licensing Our Partners Terms ...

While they don't have traditional jaws, hagfishes have two tooth-like plates made of keratin that can pinch ... forming the slime. Its structure acts more like a fine sieve that slows water down ...

Teeth can be vital to evolutionary success, notes the vertebrate zoologist Bill Schutt in “Bite: An Incisive History of Teeth ...