Meet Mr. Fangs!
|Polychaetes always look worried.|
Actually, those two front projections aren't fangs. They're antennae; the other six projections around his head are tentacles. The front paddles are palps, for handling things. He seems to have four eyes, although I would need a closer photo to be sure.
I found a page that describes these worms beautifully, with a long section on the structures of the head. It includes this diagram, which I found helpful.
|Image from Reefkeeping.|
Ronald Shimek explains:
This diagram represents the head of a generalized polychaete as viewed from above. I know of no real animal with all of these structures in this pattern. However, there are worms having some of all of the structures illustrated here.