Bests & Worsts Reviews from Amazon

As a pharmacist, I can discern patterns of problems with drug products from reports like the reviews here on Amazon. When I can confirm these issues personally, it's clear that there is a problem with this product. Specifically, within less than a week after switching from a Crest product to Complete Care, I noticed what seemed like canker sores on my lower lip. This was accompanied by what I can only describe as "roughness" on the buccal side of my lower mouth. Similar to what you might find after drinking something too hot and the epithelium sloughs off a bit. (Oral tissues like gums or lips, fortunately, are some of the fastest healing tissues in the body.) In any event, after just four days switching back to plain basic Colgate, all the lesions in my mouth have abated. This seems more than anecdotal where almost half the reviewers are noting similar problems. Someone in an earlier review suggested contacting the FDA. I'll say more specifically to Google "MedWatch." You'll be taken to the FDA website and there is a form for consumers to report adverse effects from drugs, "medical foods," devices, and cosmetics. There definitely is something going on here.