Ulcer is an idiopathic condition you can not directly come to a single cause of it. I think as per your symptoms you may have  sharp edges of lower and upper molars. You should also have a regular diet to avoid constipation and other indigestion difficulties to avoid heat and this will indirectly reduce your ulcers. Have ninefol tab twice a day and apply amlenox gel twice a day

Hi .dont worry .use kenacort gel over ur ulcer 2-3times /day.and take becosules (once after breakfast for 15days).