G.L.O. (Guided Light Optic) technology has revolutionized whitening by addressing the compromises of other whitening systems. The GLO Brilliant Teeth Whitening Device, when used with the Whitening G-Vial Gels and Whitening Mouthpiece, illuminates with a brilliant blue light as it gently warms. The heat accelerates the whitening gel inside the closed system mouthpiece, resulting in faster, more efficient, and longer lasting whitening without the sensitivity. It is clinically proven to whiten teeth by five shades in as little as five days with little to no sensitivity.