A wisdom tooth, in humans, is any of the usual four third molars. Wisdom teeth usually appear between the ages of 16 and 25. Most adults have four wisdom teeth, but it is possible to have fewer (hypodontia), or more, in which case they are called supernumerary teeth. Wisdom teeth commonly affect other teeth as they develop, becoming impacted or "coming in sideways." They are often extracted when this occurs.
Read more about Wisdom Tooth: Impaction, Partial Eruption, Extraction, Post-extraction Problems, Treatment Controversy, Vestigiality and Variation, Potential Uses For Extracted Teeth, Etymology
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The horn’s sweet note and the tooth of the hound.”
—William Butler Yeats (1865–1939)