Wisdom teeth are the four third molars, one on each side of the upper and lower jaw. They often begin to erupt at the age of 18-25, when the physical and psychological development of human beings is close to maturity, so it is seen as a symbol of “wisdom coming”, so it is called “wisdom teeth”, with the evolution of human beings, the four wisdom teeth do not necessarily grow all, some people’s Some people’s wisdom teeth may only grow 1-2, and some people do not grow wisdom teeth. However, if the wisdom teeth do not grow to their normal physiological position, this condition is known as wisdom teeth obstruction, and commonly referred to as obstructed teeth. Many people believe that wisdom teeth need to be removed as soon as they erupt. In the United States, the concept of prophylactic wisdom teeth removal used to exist, but wisdom teeth removal is also a surgery that sometimes causes serious complications and even death. 1.Recurring pericoronitis: Insufficient space for wisdom tooth eruption will cause swelling and pain of gum tissue, if this condition occurs repeatedly, it is recommended to extract the wisdom tooth after the inflammation subsides. 2.Dental caries: The decayed tooth that does not reach the pulp (dental nerve) can be filled, but if the decay is deeper and needs root canal treatment, it is recommended to extract it. 3. Causing adjacent tooth lesion: Patients with adjacent tooth lesion usually do not feel it, and most of them are found by dentist with X-ray diagnosis. This is due to the lack of space for the eruption of wisdom teeth, ectopic obstruction leaning on the second molar, causing the second molar is not easy to clean, or even the second molar is partially absorbed, which will cause discomfort or pain or even the second molar is completely loose in serious cases. 4, no opposing teeth: If there is no opposing wisdom teeth to oppose the wisdom teeth to bite, sometimes the phenomenon of wisdom teeth elongation will occur, and then affect the bite, then the wisdom teeth should be extracted. 5.Crowding: The force of wisdom teeth erupting forward can cause crowding, which may affect the effect of orthodontic treatment in patients who have undergone orthodontic treatment, and wisdom teeth should usually be extracted in this case. 6. Causing other lesions: If the wisdom teeth cause odontogenic cysts or tumors, they need to be extracted. If there are no such problems and your wisdom teeth are not causing problems to other teeth or yourself, then there is no need to remove your wisdom teeth at all.