DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Dental abscess (swelling at upper left) affecting the right side of a 58-year-old woman's mouth. An abscess is a local collection of pus, usually due to infection. In this case, the infection is of a tooth due to tooth decay. In severe cases, an abscess may need to be surgically drained and cleaned, and here the tooth may need to be removed.
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