Our Blue Light is based on the very same light used in dental surgeries but adapted for home use. Blue light works by accelerating the whitening process, the light used accelerates the breaking down of carbamide peroxide into hydrogen peroxide, which reduces the time taken to get white teeth. Therefore you truly get white teeth fast. The Blue light should be switched on and placed inside the mouth against the teeth. The Blue Light comes with two batteries and automatically switches off after 10 minutes.