Dear sir, i consumed gutkha for 1 year. I noticed black spot in left bucal mucosa few months ago with burning sensation on consuming spicy food. Since then i have left chewing gutkha. I also consulted with dentist and he gave me some antioxidants and vitamin tablets but it is same as it was . The burning seansation is little bit control but black spot is same as it was. What may be the solution sir??