Seriously, I have had a funny taste in my mouth since yesterday. So I've just looked at my teeth with on of those dentisty-type- mirror-thingies, and one of my back doubles has a large black area across half of it at the bottom. I think I would have noticed if it had been like that before. Obviously it'll have to come out, but do teeth decay just like that? It's just yuck, gross and scary all at once.