Grinigh COCONUT OIL Whitestrips Dental Professional Effects Teeth Whitening Strips comes with a 14 day treatment. It has 28 strips so it comes with a top and a bottom. The instructions are easy to read on the back of each package that you get.They are easy to apply, one strip on the top and one strip on the bottom. There is no irritation to the gum or teeth at all. Even came with a shade guide strip to measure the results. I wore them over an hour and they didn't move. These are the best, seem to be working well.