There are often the following reasons for physical weakness after tooth extraction. First, the process of tooth extraction patients are always in a state of anxiety, tension, consume part of the body’s energy; Second, the extraction of teeth need to be given a local injection of anesthesia, anesthesia metabolism will cause nausea and vomiting, lethargy, fatigue and other symptoms of the human body, extracting the teeth of the longer time the anesthesia dose needed is larger, resulting in the end of the extraction of teeth after anesthesia is not completely metabolized, the patient will still be manifested in the body of fatigue, symptoms of weakness; Third, After the extraction of the tooth wound continues to seep blood, blood loss caused by the body’s effective circulation is reduced, aggravate the symptoms of weakness after tooth extraction.