Why do you have to grow teeth when you are an adult?

Wisdom teeth, the scientific name of the third molar, commonly known as wisdom teeth, vertical teeth and full-head teeth, are the teeth closest to the throat in the mouth. If they all grow out, there are four teeth, two in the upper jaw and two in the lower jaw, which usually grow out at or after 16 years old. Compared with deciduous teeth and permanent teeth replaced in childhood, wisdom teeth usually grow when human mind is mature, hence the name. There are great differences among individuals in the growth of wisdom teeth. Some people grow up before the age of 20, some people grow up at the age of 40 or 50, and some people never grow up. This is normal. Moreover, not all four wisdom teeth will grow out completely. Some people's wisdom teeth may be only 1 2, and some wisdom teeth even stop growing when they are half grown. This condition is called impacted wisdom teeth. The position of wisdom teeth starts from the gap between the front teeth and counts the number of teeth inward from one side of the front teeth. If there is an eighth tooth, it is a wisdom tooth.

In the late adolescence, the mandible develops to the size of an adult. But some people's jaws are not big enough, and there is not enough space for wisdom teeth to erupt. Wisdom teeth will be impacted in the mandible and grow in other directions. Only part of the crown may be exposed under the gum or completely buried in the mandible. The root may deform or grow to the maxillary sinus or mandibular nerve, which is very dangerous.

If wisdom teeth don't grow out, they grow out horizontally, which is called transverse impacted wisdom teeth. Generally, they will squeeze into the lateral teeth, making the lateral teeth extremely crowded and prone to toothache.