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A tooth that is "stuck", or can grow no further into the mouth. Usually referrs to wisdom teeth, but any tooth can be impacted under unusual circumstances. Extra, or supernumery teeth, are often impacted. Impacted wisdom teeth have an incidence of cyst or tumor formation of around one to five percent. Partially impacted wisdom teeth (half in-half out) have a very high rate of periodontal (gum) infections. Additionally, pressure from impacted teeth can often cause damage to nearby teeth.