VIAILA cold light whitening instrument introduction of America's top tachnology,cooperate with Asian tooth structure, improved after repeated experiments,and through special optical processing,we repeated experiments,and through special optical processing,we reduced the tooth discomfort during operation.VIAILA cold light whitening instrument make the wavelength between 480-520 nanaometer high-strength blue ray,through more than 12000 root,the total length more than a mile fiber to preach,then through the two pisces of the 30 times coating process of optical lenses,In quarantined all harmful wltraviolet and infrared,exposure to daub VIAILA whitening gel on the teeth,in the shortest time to make the teeth whitening gel though nature tubules and take deep oxidation reduction effect with pigment which deposited in tooth surface for many years. To make white teeth back without staining.