Whitening teeth cold light meter principle is to transform the wavelength between 480-520 - nanometer high strength blu-ray, through more than 12000 root, the total length of more than a mile fiber optic transmission, through two pieces of the 30 times coating process of optical lenses, every place all harmful ultraviolet and infrared, exposure to daub on the special teeth whitening agent, in the shortest possible time to make the whitening agent through dentin tubule and deposit for years the pigment of tooth surface and deep oxidation reduction effect, make the teeth back without white before dyeing. This whitening technology not only for a long time because of smoke, drink coffee and other beverages tooth staining the whitening effect, for drugs cause tooth discoloration (tetracycline teeth, dental fluorosis), elderly, or genetic yellow teeth has very good effect.