Generally in people around 20 years old wisdom teeth, some people think that wisdom teeth can not play a role, and long wisdom teeth will appear toothache, inflammation of the gums and other symptoms, seriously affecting the daily life. The hazards of wisdom teeth are mainly the following 1, induced wisdom teeth pericoronitis: because of the extraction of wisdom teeth will have local trauma (such as the jaw teeth bite), these traumas can induce wisdom teeth pericoronitis. Because the mandibular third molar eruption (i.e. wisdom teeth) often lack sufficient position and easy to form a blockage, so this situation is mostly seen in wisdom teeth, clinically common blockage cases are near the middle of the blockage, horizontal blockage and vertical blockage and so on. Therefore, if there is no care after wisdom teeth extraction, it is easy to induce pericoronitis. 2, induced pulpitis: wisdom teeth give people a greater danger is very easy to cause food inclusions, this is because people’s wisdom teeth if you can not fully grow to the normal position, so it is easy to have food debris, bacteria, etc. Retained in the gap between the wisdom teeth and their front neighboring teeth, which is easy to cause caries in front of the neighboring teeth of the wisdom teeth, and slowly may develop into pulpitis. 3, leading to neighboring teeth loosening: wisdom teeth part of the alveolar bone is also easy to be absorbed, leading to wisdom teeth in front of the teeth loosening. Wisdom teeth that cannot erupt completely are very prone to wisdom tooth pericoronitis, which is easy to occur when you are tired and have low body resistance. Wisdom tooth pericoronitis may recur, and if the treatment is not active, there is a possibility of forming an infection in the oral and maxillofacial space, causing the loosening of neighboring teeth. Growing wisdom teeth are prone to cause pain and oral inflammation, and may also cause swelling of the cheeks, or induce dental caries, jaw pain, etc. However, some people grow wisdom teeth but have no symptoms, which need to be observed by taking X-rays to see the location of the wisdom teeth. If the position is not good, then removal of wisdom teeth is the right choice, otherwise it will affect the oral health. Precautions after wisdom teeth extraction are 1, do a good job to stop bleeding: after wisdom teeth extraction there will be bleeding, the doctor gives the patient placed in the oral cavity extraction wound on the gauze roll or cotton balls, the patient will be gauze roll or cotton balls gently biting tightly, can be spit out after 40 minutes, which can play a role in stopping the bleeding. The role of biting the gauze roll in addition to pressure wound bleeding, but also isolate the saliva, so that the blood within the wound coagulation, in favor of early wound healing. Coagulation disorders or oral aspirin and other anticoagulants, before the extraction of teeth must tell the doctor. 2, after wisdom teeth extraction and blood: some people after wisdom teeth extraction, back home and blood. Wisdom teeth extraction within 24 hours, may be in the saliva with a small amount of blood, this is a normal phenomenon, if the bleeding is more, do not panic, you should find a small piece of sterilized gauze or cotton balls placed in the bleeding wound bite, and then go to the dental emergency treatment. Try not to touch the extraction wound within 24 hours after the extraction, a small amount of red blood in the mouth is normal. If you can feel the obvious bleeding or spit out a lot of blood clots should be out of the hospital to deal with it. 3, less talk after wisdom teeth extraction: after tooth extraction should be less talk. Because just after extraction, the wound still need to heal, just after extraction to talk less, and the day as far as possible, do not talk and laugh loudly, or spit, spit, and can not use the tongue to lick the wound, so as not to let the blood flow out again. 4. Eat mainly fluids: Eat mainly fluids, pay attention to the balance of nutrition, and don’t eat food that needs to be chewed. Diet should not be too hot, too hard, do not drink alcohol. 5, pay attention to rest: 2-3 days do not do excessive physical labor and strenuous activities, to ensure adequate rest and sleep. 6, prevention of infection: in order to prevent bacterial infection, tooth extraction 24 children can buy a bottle of mouthwash, containing the right amount in the mouth, do not gargle, a moment to spit out. You can also soak a bowl of light salt water instead of mouthwash.