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- Mar 11, 2006
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My roomate got canker sores 24/7, he thought they were from stress. Toothpaste can really do it?
J knows more than I, but there is a compound in almost all toothpaste that irritates those who suffer from canker sores. You might want to search, or pm him. He did a thread related to them, but that might have been lost in the crash. Edit: Sodium lauryl sulfate is the culprit. It is even in natural toothpastes.