Necrosis of the mandible is usually caused by trauma, which affects the local blood flow or triggers a fracture in this area, and often there is a risk of necrosis of the mandible at a later stage. Generally speaking, if there is a risk of osteonecrosis of the jaw, in the early stage, there may be obvious pain in this part of the jaw, or even obvious bruising and swelling, and in the later stage, as the degree of osteonecrosis of the jaw increases. The patient will often chew, or when opening and closing the mouth, will trigger the aggravation of pain in this area, in the later stage with the necrosis aggravation, or even very serious symptoms of necrosis, and may trigger systemic symptoms, such as fever, local inflammatory reaction, in addition to the local necrotic area of redness, swelling, heat, pain, in addition to localized skin temperature is often accompanied by a slightly higher. The skin temperature is often slightly elevated. Generally speaking, for this kind of situation, most of the need to first magnetic resonance examination, to determine the severity of osteonecrosis of the jaw, in addition if it is in the early stage, try to take conservative treatment as the main, more oral some blood circulation and nourish the liver and kidney Chinese medicine, such as xian ling bao bao capsule, henggu bone injury healing agent, for this kind of osteonecrosis, really has a very good therapeutic effect.