I have had several brands of these and most work quite well. This one did not work hardly at all. I did get some minimal peel on the heels after 3 days but that was it and no other peeling whatsoever after 5. All the other brands I've used have worked incredibly well and peeling starts within a day or two. 7 days out and I still see nothing and no improvement. I was sorely disappointed. I am unsure how they work and why these don't but 2/10 will never buy again.