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However our light is on a smaller scale, based on a BlueLight System with the exact light frequency of 468 nanometers, to accelerate the whitening process. Directions. Form whitening trays are described in instructions. Apply gel to tray(s). Place tray(s) in mouth and remove any excess gel from gums or mouth. Turn light on and place in mouth against the whitening tray(s) and under lips. The manufacturer recommends using the light for 10 mins of your session. ie, If you whiten your teeth for a total of 30 mins, only use the light for 10 mins of that half hour. Note. The light will automatically cut off after 10 mins. Batteries Included.