You should try to take breakfast before wisdom teeth extraction to avoid fainting after anesthesia or during tooth extraction as follows. Wisdom tooth extraction usually requires local anesthesia, and the trauma caused by wisdom tooth extraction is generally large, if the patient is in a state of hunger, fatigue, weakness, etc., fainting may occur after local anesthesia or during tooth extraction surgery. Syncope is usually initially manifested as dizziness, chest tightness, cold sweat, weakness of the limbs, fast and weak pulse, nausea, dyspnea and other symptoms, if not handled in time, there may be a decrease in heart rate, a sharp drop in blood pressure, transient loss of consciousness and other symptoms. It is recommended to visit a regular medical institution for professional treatment with the help of a doctor.