I am chewing tobacco from last 6 years but from last 1 year I took occasionally like once in week I feel irritation while eating hot and spicy food. I can insert only three fingers in my mouth. I used to have mouth ulcer on cheeks and tongue whenever I take tobacco. I don't know how to get rid of this and not sure if I need to go to dentist or ent specialist. Please suggest some medicine and also tell me the risk % of cancer.