<<Disclaimer: Verify this information before applying it to your situation.>> Canker sores are also known as apthous ulcers. They are ulcers induced by immune reactivity. I generally see them in my patients opposite teeth that has some gum recession or gigivitis, though they occur in other places in the mouth as well. I advise my patients with apthous ulcers to get to their dentist and get treated for gigivitis and periodontitis. Sucrose, aka table sugar, is a substrate for Streptococcus mutans to make an adhesive polymer that contributes to dental disease. I advise avoidance of sucrose as well until the dental issues get taken care of. Stephen Holland, M.D. *Support summarization of posts, reply to the SENDER not the CELIAC List*