The "Bright White 123 Teeth Whitening Kit for 2" contains carbamide peroxide 44%, the most powerful gel in the world. It is used by dentists and teeth whitening professionals everyday all across America. Our fast acting gel will turn your dull, stained teeth into a smile that will light up the room as soon as you walk through the door! When you complete a 7 day regimen with Bright White 123, your teeth will be up to 8 shades whiter and will last up to a year. You may need to treat your teeth more often if you drink dark liquids (coffee, tea, red wine) or smoke. You will never have to hide your smile again. Join the 1,000's across America that have found a great reason to Smile! Each kit contains everything you will need to treat 2 people for up to 10 ten days (7 days is all most people need) SATISFACTION IS 100% GUARANTEED!!!