Wisdom teeth usually erupt around the age of 17 to 21, but there are individual differences and some people are born without them. 1. Wisdom teeth are the third molars of human beings and are the last teeth to erupt in the mouth. There are two sets of teeth in a person’s life, one set of milk teeth and one set of permanent teeth. The permanent teeth usually begin to erupt at the age of 6, and are considered complete when the second molar erupts around the age of 13. Wisdom teeth usually erupt at the age of 17 to 21, and some people are born missing. 2. In modern times, with the refinement of diet, the jawbone, muscles and teeth are gradually deteriorating, in which the jawbone deteriorates faster than the teeth, thus resulting in the gap in the jawbone not being able to accommodate the space needed for the teeth, and the wisdom teeth that erupt at the end are easily blocked and usually need to be extracted. Inflammation of wisdom teeth often manifests as swelling and pain at the back of the mouth, often accompanied by pain in swallowing, and in severe cases, restricted opening and facial swelling.