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Best teeth whitening strips - Crest 3D White Whitestrips Advanced Vivid is the best over-the-counter whitening system because it is easy to use and lightens teeth about three shades, on average. Designed to be worn for 30 minutes a day over the course of two weeks, these bandage-like strips adhere to teeth and hold bleaching solution in place. Although Whitestrips are available for over-the-counter purchase, experts recommend consulting with your dentist first.Supersmile Professional Whitening System doesn't require any extra time or steps beyond brushing your teeth. It consists of a fluoride-based toothpaste and a urea peroxide-based whitening accelerator. The two formulas are used simultaneously while brushing your teeth. The system is a good option for those with sensitive teeth as well as those with veneers and crowns -- it's safe to use on dental work. Furthermore, most users say it produces noticeable results and doesn't cause any tooth sensitivity.