JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Dental fillings and a crown. Dental X-ray of a child's molar teeth with fillings and a stainless steel crown. At lower centre is a tooth whose crown has been artificially replaced with a stain- less steel crown (white). The molar tooth above it and one to its left have each received an amalgam filling (white). A dental crown and fillings are necessary when a tooth has become chipped, broken or eroded due to dental decay. At lower and upper right are healthy premolar teeth. Each tooth has a dark inner pulp which contains blood vessels and nerves. Failure to treat a broken or decayed tooth may result in infection reaching the pulp cavity, causing the tooth to die.
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