<<Disclaimer: Verify this information before applying it to your situation.>> I received 11 emails noting problems with Tom's of Maine. Although all of you said it was not a gluten issue rather a problem with the "natural ingredients". Most of you said your symptoms included burning gums and tongue. A few of you had blisters and soreness around the gums. I received 13 emails from people saying they have used Tom's of Maine with no problems at all. Several suggested trying the ones without flouride or switching to a different flavor. I'm going to switch back to Crest (no problems in the past). If the problem does not clear up in a few days I'll see the dentist. Thanks for your emails. Jill/Texas