how severe is my cavity? It is on one of my back molars, and appears as a hole in the tooth. It hurts only slightly when I eat hard foods, other than that there is no outside pain. I want to know how bad it could be and what actions may have to be taken for it to be fixed. Getting the tooth pulled is close to out of the question. I am 15 and male. It is hard to get a picture of it, so I will draw a picture of its basic size. The gray on the drawing indicates the size of the cavity. I have a dentist appointment tomorrow. Thanks so much.