SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Dental fillings. Coloured X-ray of the head of a 38-year-old woman with dental fillings (yellow) in her teeth. The skull bones are coloured blue. The fillings are made of amalgam, a mixture of mercury and silver. They are used to fill holes in teeth where tooth decay has occurred.
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