Teeth?

I scowl, I gleam
I glow, and I'm mean
My smile does nothing
But show you my teeth

Sharp, white, and thick
A blade, needs a pick
They aren't too clean
But I swear that they scream

Fangs, tusks, incisors
Ripping through livers
Making them sick and defying the light
Exposing your crime
You know that you're mine.

Respect must be earned
This, you have learned
Being torn apart
You're seeing stars
My glare may be sharp, but my teeth are sharper
You're nothing compared to the tongue of an archer

You make me sick and you know that it's true
The grin in my teeth is reserved for you