Pre-stain remover: The pre-stain remover is applied first and works effectively because of its detergent-containing cleaning formulation which pre-treats and removes stains. LED mouth tray: The whitening gel is activated by a five-point blue LED accelerating light using five powerful LED bulbs to achieve rapid long-lasting results compared to low quality bulb options found in other kits. Whitening gel: A powerful treatment featuring a 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. Rapid results: You could see rapid visible results in the first few days, with teeth up to eight shades whiter after the full 10-day treatment. Kit includes: 2 x 5ml teeth whitening gel syringes | 2 x precision syringe tips | A 7ml stain remover | An integrated LED mouth tray | Instructions and shade guide. Teeth whitening: Achieve advanced level teeth whitening with a Smile Science Harley Street Teeth Whitening Kit in the comfort of your own home. Professional formula: The next generation formulation has been developed by a world renowned dentist who invented Colgate Total and Philips Zoom- the most prolifically used system in professional teeth whitening globally. Advanced Teeth Whitening Kit | Blue | Living Social