Kool White is an office-assisted, patient take-home tooth whitening system specially formulated to remove tooth discoloration due to foods, tobacco, and other stain-causing materials. This technology has been clinically proven to whiten teeth safely and effectively in two weeks or less. Kool White™ carbamide peroxide gel is available in 10%, 15% and 20% concentrations: 10% kit is for patients with sensitive teeth or gums; 15% kit is for regular patients; 20% kit is for patients who want faster results but do not mind possible minor sensitivity.