Wisdom teeth need to be extracted when they are decayed, otherwise they will cause pulpitis, periapical inflammation, apical cysts and the possibility of traumatic ulcers. 1. If wisdom tooth caries is not extracted, the caries damage will continue to progress, leading to pulpitis or periapical inflammation, causing pain from hot and cold stimulation, spontaneous pain, biting pain and other symptoms; 2. Under long-term chronic stimulation, a small number of patients with apical periodontitis have the possibility of progressing into apical cysts; in addition, the performance of caries is not smooth, and it is easy to cause traumatic ulcers, and there is a risk of cancerous transformation under long-term stimulation. 3. Finally, in modern society, most people’s wisdom teeth are blocked, if not removed itself is also easy to recurring anti-inflammatory. It is recommended to regularly check the oral cavity, there are problems early medical treatment, so as not to delay the condition.