PUBLIC HEALTH ENGLAND / SCIENCE PHOTO LIBRARY PUBLIC HEALTH ENGLAND / SCIENCE PHOTO LIBRARY
Teeth whitening laser. Dentist holding a laser used to whiten teeth. The laser activates hydrogen peroxide that has been applied to the patient's teeth in a gel. The hydrogen peroxide bleaches the patient's teeth. Teeth can become stained by drinks, such as red wine or coffee, smoking, nerve degeneration or age. The effects can last up to 3 years. This laser works at a wavelength of 815 nanometres.
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