I bought this cause it was the cheapest and I wanted to whiten my teeth.. It took about a week for it to get noticeable white. They aren't pearly white, but it looked like a more natural color. I don't know if it was just my teeth personally but it burned when I had to let it sit on for a few minutes. My dentist said my gums needed to breath. They were starting to get damaged. Also, even with my teeth dry the strips started to slide around. Especially the bottom row. If you need a quick and cheap white teeth then I'd recommend this. But if you have the money to get a higher prices strips then I'd recommend getting those instead.