Hi... Welcome to healthcare magic. As you mentioned you have problem of mouth ulcer that may be because of reflux problem or some allergy to substance.. Stress and tension also affect.. Nutrition deficincey may cause mouth ulcer. Smoking and drinking also affect. Oral swab culture helpful for diagnosis.. Endoscopy is helpful for further diagnosis.. Consult a gastroenterologist for further diagnosis.. Avoid alcohol drinking and smoking.. Topical analgesic helpful. Avoid trauma by using soft brush.. Thank you.