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"__KEY INGREDIENT:__\\n\\n\\n\\n Hydrogen peroxide (whitener)\\n\\n__HOW IT FEELS/SMELLS/LOOKS:__\\n\\n\\n\\n Each plastic strip is lined with the gel-based formula. One strip is placed on the upper teeth and one on the lower. The strong adhesive keeps them in place for two hours.\\n\\n__WHY IT'S A BREAKTHROUGH:__\\n\\n\\n\\n Most at-home whitening kits don't live up to in-office treatments on two fronts: not enough bleach (dentists recommend more than 7 percent hydrogen peroxide) and scant tooth-to-peroxide contact. This system addresses both issues with a thicker gel layer of 10 percent hydrogen peroxide and better-fitting strips with notches that curve around teeth. Each treatment does take two decidedly un-fun hours\u2014but just grin and bare it. We noticed brighter teeth after removing the strips on the first try. We also developed some minor tooth and gum sensitivity during and after treatment\u2014the kind that turned us off of hot coffee (which isn't something you want to drink when fighting surface stains, anyway). But this went away after a few weeks.\\n\\n__AWARDS:__\\n\\n\\n\\n  Readers' Choice Breakthrough 2012, Readers' Choice 2011\\n\\n[BEST BEAUTY PRODUCT REVIEWS &gt;](http://www.allure.com/beauty-products/beauty-product-reviews)\\n\\n#### Featured In\\n\\n- [Readers' Choice Breakthroughs 2012](http://www.allure.com/beauty-products/readers-choice/2012/2012-readers-choice-breakthroughs)\\n\\n\\n- [Readers' Choice 2011](http://www.allure.com/beauty-products/readers-choice/2011/2011-readers-choice-awards)\\n\\n\\n- [How to Be Sexy: 7 Weird (But True) Rules of Attraction](http://www.allure.com/beauty-trends/how-to/2013/how-to-be-sexy)\\n\\n\\n- [Whitney Port Talks Sparkling Teeth, Pretty Makeup, and Lazy Blowouts](http://www.allure.com/beauty-trends/blogs/daily-beauty-reporter/2011/11/whitney-port-talks-sparkling-teeth-pretty-makeup-and-lazy-blowouts.html)\\n\\n\\n- [Look Younger for Your High-School Reunion&amp;mdash;Right Now!](http://www.allure.com/beauty-trends/how-to/2011/look-younger-for-your-high-school-reunion)\\n\\n\\n- [Cavities Are Contagious! Who Knew?](http://www.allure.com/beauty-trends/blogs/daily-beauty-reporter/2012/04/cavities-are-contagious.html)"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.allure.com/review/crest-3d-white-2-hour-whitestrips>