Enlightened Expressions uses our Pre-Filled LED System mouth pieces that have been specially designed for maximum comfort and focused LED targeting. Perfect smiles are created with our trend setting system that has been clinically proven to be unmatched in terms of safety and effectiveness. Our special lighting systems intensify the release of hydroxyl radicals that accelerate the dissipation of tooth stains. Our advanced spectrum LED light is precisely positioned and controlled. Its energy is directed just to the outside of the clear mouth piece between the upper and lower teeth. This very safe visible blue light works in conjunction with the Enlightened Expressions Whitening Gel to achieve extraordinary results.