Extraction of a wisdom tooth (third molars) is necessary for the prevention of the spread of infection. Wisdom teeth extraction also provides permanent pain relief in cases when the tooth is impacted, and does not grow out from under the gum line; in this situation, the tooth pushes sideways against the other teeth, causing extreme pain. An impacted wisdom tooth is also very prone to decay, since it is very difficult to properly brush and clean the tooth from under the gum line.
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