DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Erupting wisdom tooth. Close-up of the mouth of a 20-year-old woman showing her erupting lower left wisdom tooth (upper centre). There are four wisdom teeth or third molars, which develop or "erupt" in most people between the ages of 17 and 21. Here the tooth is partially erupted, with two cusps (white) fully emerged; the rest remain below the gum (pink) and are seen in outline. In many cases wisdom teeth are unable to emerge fully from the gum due to lack of available space. This may cause severe pain and usually results in their removal.
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