<<Disclaimer: Verify this information before applying it to your situation.>> Anyone had a bad reaction to a "whitening" toothpaste? I used one that is listed as GF on the Clan Thompson list, but I highly suspect it of causing a bad GI reaction. I have gone over everything else I have ingested recently, and am stymied as to what else it could be. I eat a very simple diet -- no grains, no sugars, no dairy, and GF. I used the toothpaste once, and the following day had the reaction. Anyone else have this experience? Will summarize. Latimer