I had a small piece of hard, dead skin in the middle of my top lip. It was relatively small (less than a quarter of my pinky nail) and it was easy not to get water/food on that area so I didn't bother removing it. It stayed on for more than two months but when it did fall on its own, the skin underneath looks pink and healthy. It's been a month and there's no buildup on this little area. Unfortunately I don't think I'll be able to do the same thing on my lower lip unless I don't eat/drink/talk for a few months since these movements or stretch may just cause more trauma.