This product is presented in a PH neutral balanced formula which reduces enamel erosion, gum irritation and tooth sensitivity. SpaWhite removes surface stains from teeth using a patented foam suspension peroxide delivery system and DayLight 5K light. Developed to combat the effects of acidic and strongly pigmented foods, drinks, tobacco, as well as normal aging all of which cause discoloration. Up to 6 Shades Brighter. Enamel safe.