Wisdom teeth are the third molars, the last teeth to erupt in the dental row, and most people erupt between the ages of 18 and 30. As the evolution of human beings, with the change in the type of food, brought about the degeneration of the chewing organs, resulting in the length of the jawbone and the required length of the dental row are not coordinated, the amount of bone is less than the amount of teeth, in layman’s terms, that is, the bone can not accommodate so many teeth, so resulting in the clinical wisdom teeth eruption position is insufficient, resulting in obstruction. The most common hazards of wisdom teeth are the following: 1, wisdom teeth pericoronitis wisdom teeth in the eruption process, the crown surface is often partially or fully covered by gums, forming a blind pocket, food and bacteria are very easy to embed in the blind pocket, coupled with the crown gums often due to chewing food and bite, the formation of ulcers, when the systemic resistance to decline, can cause an acute attack of local inflammation, resulting in local gum redness, swelling, pus overflow, and even appear Restricted mouth opening, fever and other symptoms. 2.Caries Wisdom tooth blockage is often easy to food residue embedded in the interdental and periodontal gaps between the second molar and wisdom tooth, which is not easy to remove, causing the second molar in front of the caries, and in serious cases, causing the inflammation of dental nerve, i.e. pulpitis. In acute pulpitis, the tooth will be painful with hot and cold stimulation, spontaneous pain and severe pain, which affects life. Therefore, it is recommended to extract the wisdom tooth in the wrong position as soon as possible to avoid unnecessary pain.