Up to 8 Shades Whiter: this two-part clinically proven Dentist approved formulation delivers intensive stain removal and professional teeth whitening results for sensitive teeth within 10 days. The pre-stain remover is first applied and works effectively because of its detergent containing cleaning formulation, which pre-treats and removes stains. This treatment is different from other whitening kits thanks to the breakthrough Percarbonate formulation in the whitening gel. For sensitive teeth, the gel is infused with ingredients to nourish and strengthen teeth for optimal oral health. The whitening gel is activated by a 5-point Blue LED Accelerating Light using five powerful LED bulb technology to enhance whitening gel process and achieve rapid long-lasting results compared to low quality bulb options found in other kits. We know how important using the right teeth whitening kit can be, and our proven results show that Smile Science offer the best home teeth whitening kit.