How does the GLO Professional at home kit work?

The GLO Professional At Home Kit uses patented GLO heat & light technology inside the mouthpiece, combined with specially formulated 10% hydrogen peroxide whitening gel. The whitening gel is applied directly to the teeth. When the mouthpiece is inserted, it traps the whitening oxygens against the teeth so they can't escape and then gently warms them to the optimal temperature for accelerated whitening action.