Do blood worms have teeth? Blood worm shows its sharp teeth when going for a bite. Bloodworms will eat anything that passes by them and fits in their mouths. To catch prey, they evert (turn inside out) part of their digestive system, which includes their teeth, and launch it out of their mouth. The researchers think that the different toxins found in bloodworm venom act on different prey. This Worm Uses Copper to Harden Jaws and Fangs. | Howard Farran DDS, MBA