BSIP, RAGUET / SCIENCE PHOTO LIBRARY BSIP, RAGUET / SCIENCE PHOTO LIBRARY
Teeth bleaching. Dentist applying a laser to activate a bleaching gel on a patient's teeth. Hydrogen peroxide is released from the gel, which whitens the teeth but does not alter their shape. Teeth discolouration is caused by ageing, drinking red wine or coffee, smoking and nerve degeneration. The effects of bleaching last for around one year.
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