causes of ucers: stress.. tissue injury...certain citrous foods and vegetables...vit b12 ,iron,zinc,folic acid deficiency how to cure:coming t root cause...apply dologel haf hr before and after food for 15 min den rinse

There are many reasons for oral ulcerations especially those which are recurrent and multiple. The exact cause in your case can be delineated only after a proper clinical evaluation and a detailed clinical history about your oral habits like tobacco or other history of medications. Going only by the description that you have mentioned it will be very difficult to provide a rational suggestion regarding your query. Regards.