Wisdom teeth, the third molar in humans, generally erupt at the age of 18 to 25. As humans evolve, both the jawbone and teeth tend to degenerate, but the rate of degeneration is different between the two, with the jawbone degenerating faster than the teeth, so that the teeth appear larger compared to the jawbone, forming wisdom teeth obstruction. The incidence of wisdom teeth obstruction is high, and its harm is mainly manifested in the following points. 1. Recurring pericoronitis. The formation of a blind pocket between the soft tissue around the crown of a blocked wisdom tooth and the tooth causes the accumulation of food residue, and when resistance decreases, pericoronitis is inevitable. The blocked wisdom tooth can cause inflammation of the surrounding soft tissues and cause infection of the surrounding interstitial tissues through as many as seven drainage channels, and in severe cases, the opening will be restricted and the local redness and swelling will be feverish, which will affect eating. 2.Decay of adjacent teeth. The food residue is easily accumulated between the wisdom tooth and the second molar with incorrect eruption position, and it is not easy to clean, which can form caries in several months and directly destroy the tooth tissue. 3.The blocked wisdom teeth often cannot establish normal occlusal relationship with the teeth of the opposite jaw, which can lead to the symptoms of popping of temporomandibular joint, painful opening of mouth and night grinding for a long time, which has a great impact on physical and mental health. 4, orthodontic patients may also be affected by the eruption of wisdom teeth orthodontic effect, there is also evidence that some obstructed wisdom teeth is the focal point of some trigeminal neuralgia. The wisdom teeth that cause the above-mentioned harm are recommended to be removed as soon as possible.