question: Hi, my gums on one side of my mouth have been feeling sore. Today I woke up with pain on one side of my teeth. I looked in the mirror and noticed something there - I think a piece of steak, between my second molar and first premolar. It looked a bit green. I brushed it, and afterwards it began to bleed a lot. Now it feels more sore and I notice a small black hole which looks like it is on the gum. Is this any cause for concern?