First up – how does it work? A teeth whitening light must be used in conjunction with a teeth whitening substance, such as hydrogen peroxide or other whitening agents. After you or your dentist applies the whitening agent to your teeth, targeting the light on your teeth activates the whitener.
Is using light activation worth it, though? Researchers have found that laser, halogen, and LED light activation increase the lightening of a tooth's shade and maintain the lighter shade for longer than non-light-activated teeth whitening in a study published in the Journal of Conservative Dentistry, a peer-reviewed medical journal published on behalf of the Federation of Operative Dentistry (India). Laser and halogen lights were found to be most effective.