About 2 years ago my dentist told me I had a large shadow on my dental x Ray (upper jaw). He said he didn't know what it was, but not to worry about it. I have noticed a swelling or thickening in the gums in that area for some time. My dentist monitors my tooth mobility in that area. In the last 2-3 months I developed tenderness in that area and it bled every time I flossed for about a month. In the last few days I have developed constant aching in that part of my jaw and and it is very tender near one tooth in particular. This tooth also moves slightly when I push it. I have a dentist appointment coming up and I want to get some answers and help. Should I worry about jaw cancer, or is it likely to be a simple tooth abcess that he can treat easily? Please help. Thank you in advance.