I have mouth ulcer problems for more than 10-13 years. I have eaten Becosules and also applied mouth ulcer gel for many months but the problem does not eradicate completely. And I stopped taking becosules.Recently I discovered I have fasting blood sugar of 150. I started metformin 500 mg one time . Should I start becosules again or vitamin B12 tablet? Also I have got many teeth changed and I also used artificial teeth for 10 years. Is my problem related to my artificial teeth ? P.S : I smoke 1-2 cigarettes daily from 20+ years