I had the same problem of sheets of tissue from the inside of my cheeks sloughing off. It did not hurt but was very annoying. My dentist said it must be a reaction to the additives in toothpaste. I tried everything. Could not figure out for Years>>>>>>>>>>. until I stopped using my electric toothbrush and then I realized I had no more shedding. I now brush with a regular toothbrush and I have not had the problem since. Strange isn't it. I think it must be trama to the tissue from the agitation of the electric toothbrush that did it. Hope this is the answer for others as well.