Sixty-four per cent of all 20-year-olds have all four wisdom teeth, while 2% have none at all. Wisdom teeth usually erupt at the age of 19 or 20, and the eruption tends to last until the age of 25. However, in 90% of young adults the eruption is incomplete due to lack of space. As a result, the gum surrounding the wisdom tooth becomes easily infected. Signs of infection are more common in the lower wisdom teeth. Poor oral hygiene may predispose to infection. Over 50% of 20-year-olds have to have at least one wisdom tooth removed. Correct timing is important; your dentist will evaluate the timing of the removal at a dental check-up.
A recent x-ray is required for wisdom tooth removal.