Package including: 1pc Main Unit; 2pcs silicone cover ; 1pc Adapter; 1pc English Manual ; 2pcs Goggles (as gift) . Features: - In line with human nature and special optical design whitening teeth; - Robust and flexible gooseneck for easy curing at different angles ; - Function selection easy to operate - A digital LED with sound effects that makes it easier for physicians to use; - Quiet and efficient fan for best heat dissipation ; - Delicate, lightweight exterior design, elegant and generous with clinic space; - Low light and average light when whitening Adaptation: - exogenous pigment sticky stains (smoked, coffee, coke, etc.) - Endogenous pigmentation (mild tetracycline tooth, etc.) - Fluorine Spain - Congenital uneven color - Applies to unknown triggers caused by black and yellow tooth flank change Whitening principle: Cold light whitening the Department of the use of blue light wavelength 400 ~ 500nm (the temperature change is not obvious, it is called cold) will be applied to the tooth surface concentration of 20% to 38% peroxide whitening agent catalysis by redox hydrogen peroxide The role of free radicals, change the carbon ring structure of the pigment, so that pale teeth whiten color. Cold light whitening indications: The color of the tooth surface diminishes with age and even becomes amber orange. In addition, smoking, drinking coffee, tea, red wine, or congenital, genetic and drug (such as tetracycline) caused by tooth discoloration, can be through the cold light whitening to improve the color of teeth. But young and young and pregnant women are not suitable for cold light whitening