Blue and red LEDs are medically proven to enhance gum health, freshen breath, and whiten teeth. This is one of the most advanced over-the-counter whitening systems you can buy, and it works wonders. The blue light helps reduce bacteria, causing a whitening effect, while red and infrared lights actually improve gum health by increasing blood flow. Increase the effectiveness of whitening gels by removing stains from coffee, leaving whiter healthier teeth.The dpl oral care system reaches a larger area than competitors & improves gum health and can be used with whitening strips or gels for enhanced teeth whitening. Voted the best teeth-whitening product for any budget buy GQ™ magazine.