I love this product, I have used it a number of times in the past and when I run low, I re-order more. Simple and easy to use: place solution in a tray provided and leave on teeth for a minimum of 10 minutes. I do this about 3 times a week when first starting out, then I use maybe once weekly to keep white! I love it, I drink lots of coffee, ice tea, and (sadly) I smoke, but you wouldn't know it by my teeth! Highly recommend using this product. You can't beat the deal for the price anywhere for such an effective product.