The wisdom tooth is the third molar tooth, which appears later than the other teeth, and sometimes does not erupt at all. A person cannot have more than 4 wisdom teeth. The approximate age when tthese teeth grow is 18 - 27 years. They are called so because they begin to erupt in the period from ages 18 to 30. Scientists consider them a rudimentary organ that does not carry any functional load when chewing food. Usually impacted wisdom teeth, which grow horizontally in the jaw, cause discomfort....