Summarize: 1. The led cold light bleaching system which is made in our company is the most advanced brand in china at the present time. It is controlled by the microcomputer inside the machine, and it can catalyze the whiten pharmacy and cause a reaction exactly and effectively, and it will make the teeth whiten deeply. Its output blue light wavelength is 430-----485nm, and it can irradiate all parts of the teeth effectively, so every one of the tooth can be whiten. It is the key breakthroughs of the clearing the teeth and the whiten technology in the dental area. 2. If you use the whiten pharmacy which is provided by our company, the whiten effect will be more perfect. Accommodation: External causes of tooth color pigment nien 1. External color of the pigment nien teeth (smoke spot coffee spot, tea spot and so on). 2. Internal pigment teeth tetracycline pigmentation teeth, dental fluorosis. 3. Hereditary xanthodont. 4. The reason unknown which cause the teeth darken and yellowing. Technical parameter: Dimension of frame. Size: height: 142cm; wide: 63cm; arm length: 125cm· longest Weight of machine·ª18.5k; Input voltage·ªac110or240v·+50/60hz; Power·ª30w; The wavelength of blue light·ª460-490m; The whiten hour 10·í15minutes for one time, two or three times for one period of the treatment.