Wisdom teeth, the scientific name of the third molar, commonly known as wisdom teeth and upright teeth, are the teeth closest to the throat. If they all have one ***4 and two maxilla, they are generally 16 years old or later. 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.

Start with the front teeth and count the number of teeth inward from one side of the front teeth. If there is an eighth tooth, it is a wisdom tooth.

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Wisdom teeth and evolution

There may be two reasons for the degeneration of wisdom teeth: first, the mandible became smaller and there was no room for wisdom teeth in the process of human evolution from apes; Second, it may be related to oral hygiene. It is common for young people in ancient times to have more teeth or to lose most of them. At this time, the wisdom teeth that have just grown come into play. Modern stomatology is developed, and everyone has the habit of brushing their teeth. Unless there is an accident, young people's teeth will generally remain intact and wisdom teeth will become redundant. Because there is no room for growth, wisdom teeth often feel pain when they grow, and their position and direction will be abnormal after eruption. Most people's wisdom teeth have no chewing function and no occlusion. In other words, wisdom teeth are generally redundant and are considered as trace organs.

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Diseases caused by wisdom teeth

Because of the special position of wisdom tooth growth, it brings many problems to its cleaning and treatment. The common diseases are dental caries, periodontitis and pulpitis.

Because wisdom teeth are in the innermost part, it is not easy to clean them when brushing teeth, which is easy to cause tooth decay. Moreover, wisdom teeth often have swelling pain due to insufficient germination space, and they will invade adjacent teeth and cause toothache. In addition, because there is no occlusion, sometimes wisdom teeth will erupt excessively, affecting occlusion; Sometimes it will erupt into impacted teeth, resulting in uneven dentition, pericoronal space infection and difficulty in opening mouth.

Wisdom teeth are the third molars, which have an important influence on the adjacent second molars. Because most wisdom teeth are impacted forward and butted with the second molar at an angle of about 45 degrees, forming a crown angle, which is easy to embed into food, leading to long-term caries and even pulpitis of the second molar, even if it is not so serious, it will affect the life of the second molar.

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Extraction of wisdom teeth

Because of the diseases that may be caused by the above wisdom teeth, in order to avoid future troubles, most professionals suggest that wisdom teeth be removed. There are still some people whose wisdom teeth will not cause any trouble, which is determined by their physiological structure. These people don't need to have their wisdom teeth pulled out. Because the position where wisdom teeth grow is a branch of trigeminal nerve, if it is not handled properly, it may affect the feeling and even vision in the mouth. However, the roots of mandible and wisdom teeth of adults have been shaped, and the extraction of wisdom teeth is dangerous. Used for patients with diabetes, heart disease, etc. It is easy to cause complications when tooth extraction, so we should be cautious about wisdom tooth extraction for this group of people.

Because there are 3~4 wisdom teeth, the growth position is not conducive to surgery. Generally, the method of taking out the wisdom teeth by breaking the crown is chosen. Because the use of anesthetics will not feel pain during the operation, people should adapt to this process psychologically, and some people do not cooperate with the treatment because of fear. For some wisdom teeth with less exposed crowns, the gums may be cut off when they are pulled out, which will bring some pain to wound healing.