Posted 3/20/2012 11:17 PM (GMT -6)
This has plagued me for years and I've found that switching to "sensitive" mouth products makes a HUGE difference. Try switching to Sensodyne or Aquafresh Sensitivity or another sensitivity toothpaste, and do the same for mouthwashes. Also make sure you use a "gentle care" floss, like one that's woven rather than waxy and sharp. This problem was unbearable before I made these changes. Also, acidic foods and juices will aggravate the problem - I've noticed it mostly with orange juices. I had a GI doctor explain to me that since Crohn's causes general inflammation and sensitivity in the mucous membranes (including the lining of the mouth), minor injuries or irritants (like non-sensitive toothpaste) can inflame to become painful ulcers.
Background: this happened to me constantly in my late teens - multiple, painful white ulcers. I went to multiple dentists that couldn't offer much to help (but could confirm it was not herpes or cold sores or anything else communicable). Less than two years later, I was diagnosed with Crohn's disease, and have ever since been told that this is a typical "mild" Crohn's symptom.