I had painful canker sores for about 10 years, usually occurring about once a month. Now I've only had one mild one in a year. I found out they can be caused by Sodium Lauryl Sulfate, the ingredient in toothpaste that makes it foam up. I found a toothpaste that doesn't have that and it's called Biotene and is made for dry mouth. I found it at K-Mart and CVS, but haven't seen it at Wal-Mart. The tube costs $7 - $8, but it's sooo worth it not to have canker sores! K-Mart (here) stocks theirs beside denture cream instead of toothpaste. I hope it works for you!
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