Is there anything out there that looks like a teethmark...like makeup or temporary tattoos?

well bella is left w/ a half moon crescent scar so why don't u just get some shimmery white or silver eyeshadow and use that to draw the scar.

You can try buying something at a costume store. If you want the healed look You can just use a brown eyeliner with a tiny bit of fake blood on the tip, and draw your a moon shaped scar.

here's an idea: improve your taste in literature. it'll do you good.