I went to my dentist a couple weeks ago and asked about the teeth whitening kits available through his office. Since he is a friend of my husbands...he didn't try selling me on any of their kits and he told me that my teeth were white enough that it wouldn't be worth the money to buy the expensive kits. Instead, he told me to try the Crest Whitestrips available over the counter. He told me that they contain the same ingredient (hydrogen peroxide) as the ones purchased from the dentist office...just in a smaller percentage...perfect for someone like me who doesn't want to transform their smile...just brighten up. I have used Crest Whitestrips before, but the new Crest Whitestrips Advanced Seal is really so much better! Truly a case where the "new and improved" really is!! Each kit contains 14 doses of the whitening. Each package contains a top and bottom 'sticker' of the product that instantly adheres to the teeth. Surprisingly comfortable, they stay on for a half an hour, and then peel off without any mess (totally different than the ones I used to use!). You are supposed to use them once a day for 2 weeks...but since I had a benefit to go to this past weekend...I used them twice a day for the past 4 days. I so regret that I didn't take before and after pictures...but, wow, my teeth look good!! Pearly white!! I could tell a difference after 2 days...2 days!! My teeth were a bit sensitive from using them twice a day...but that is the price you pay for beauty I guess!! I will continue using the rest of the doses, but just once a day as directed! Available at any drugstore or grocery store.