Wisdom teeth, also known as third permanent molars, include two types: maxillary wisdom teeth and mandibular wisdom teeth. Wisdom teeth arise mainly due to changes in dietary habits and refinement of food, which tend to cause degeneration and shortening of the jawbone, resulting in ectopic eruption and blockage of teeth due to lack of space. The age of tooth eruption and the clinical manifestations of wisdom teeth can be used to determine whether wisdom teeth are present. The average age of eruption is 17-21 years old, and the growth and development of wisdom teeth takes more than ten years; if people in this age group show symptoms of tooth growth, we can initially judge that wisdom teeth are growing. 1.Bacterial plaque or cavity: After the wisdom tooth erupts, it is easy to form a triangle or deep pit-shaped gap with the surrounding adjacent teeth, and the food residue in the mouth is easy to stay in the part after eating, which is difficult to clean and easy to produce bacterial plaque; especially for the low near-middle blocked wisdom tooth, it is in the anaerobic environment for a long time, and after the bacteria attach, grow and reproduce, it can produce a lot of acidic metabolites, which can cause tooth demineralization and easy to form caries. cause tooth demineralization and easy to form cavity. 2.Swelling and pain: In the early stage of acute inflammation of wisdom tooth, the patient can have slight swelling and discomfort in the affected area, and the pain is obviously aggravated under chewing, swallowing and speaking, etc. The local spontaneous throbbing pain can appear, and it can be dissipated to the ipsilateral head and face.