Wisdom tooth is the last tooth to erupt, because it usually erupts between 18-30 years old, compared to other teeth, people in this age are already mentally mature, so it is called “wisdom tooth”, which is the third molar. Wisdom teeth are usually 4 upper, lower, left and right, and the third maxillary molar is missing in clinical practice, and some people do not have wisdom teeth, so the number of human permanent teeth is 32-28. Due to the evolution of human beings, the food becomes more and more refined, and the chewing function of human beings declines, and the corresponding jaw bone is gradually shrinking. Compared to bone, the evolution of teeth was much slower. This has resulted in a disproportion between the amount of teeth and bone in modern humans, mainly because the amount of teeth is greater than the amount of bone, which means that by the time the wisdom tooth erupts, there is not enough space in the jawbone, especially the mandible, to accommodate it. This results in crowded teeth, incomplete eruption of the wisdom teeth, and even if they do erupt, they are still backwards. The most common disease that results from incomplete eruption of wisdom teeth is pericoronitis. The uneven wisdom teeth and the adjacent teeth can easily cause food congestion, and the wisdom teeth are located at the very back of the tooth row, so it is difficult to self-clean and brush. The accumulation of food over a long period of time causes bacteria to multiply and eventually pericoronitis occurs. When the body’s resistance is reduced, such as long travel, car rides, staying up late, girls’ menstrual periods, colds, etc., wisdom teeth pericoronitis will come on, its typical symptoms are pain, swelling, overflowing thick, bad breath, etc.. These diseases often make people suffer a lot and have trouble sleeping and eating. If you have a painful wisdom tooth, you should go to the hospital to get treatment, do not delay, otherwise there will be various interstitial infections around the wisdom tooth to cause more serious diseases. The treatment of pericoronitis is usually a local cleaning, cleaning all the food residue and thick liquid around the crown, and then taking some oral anti-inflammatory and pain-relieving drugs. If you’re looking for a new way to get the most out of your life, you’ll be able to get the most out of your life.