Wisdom teeth usually grow at the very back of the upper and lower jaw teeth. 1. Wisdom teeth are the third permanent molars of human beings, which usually start to grow at the age of 18 to 25. However, due to the different conditions of each person, the shape and number of wisdom teeth will vary to a certain extent, and part of the population will have all 4 wisdom teeth, part of the population will have 1~3 wisdom teeth, and part of the population will not have any wisdom teeth for their whole life. 2. Normal wisdom teeth erupt vertically, but nowadays people eat more and more fine food, and the alveolar bone will deteriorate to different degrees, which will lead to insufficient space for wisdom teeth to erupt, resulting in partially erupted wisdom teeth or no eruption at all. Partially erupted wisdom teeth are prone to form blind pockets, resulting in pericoronitis, or forming gaps between the wisdom teeth and the second molars, which can lead to food impaction and caries in the second molars. When patients experience discomfort in their wisdom teeth, it is recommended that they go to a dentist in a regular hospital and follow the doctor’s instructions. In daily life, we need to pay attention to oral hygiene, and develop the habit of brushing teeth in the morning and evening, and rinsing mouth after meals.