$25 off orders over $79 + free shipping with rebate. Promo code: SPRING25The advanced Teeth Whitening System uses the same medical-grade whitening gel and plasma light technology seen in cosmetic dental offices to give you a whiter, brighter smile at home. Simply apply whitening gel to your teeth, place the device in your mouth and bite down. Use it for just 2-4 minutes a day to get teeth get up to four shades whiter, without costly strips or messy trays. Includes whitening guide and gel (30-35 applications).