When the blood pressure exceeds 140 mmHg systolic and 90 mmHg diastolic, the doctor considers the patient’s blood pressure to be significantly elevated and unsuitable for surgical procedures, including tooth extraction. For surgeons or dentists, if the blood pressure exceeds this target value, the patient’s blood pressure is considered to be high, and such people are prone to bleeding in the wound during surgery or operation, and the effect of gauze and cotton ball filling to stop bleeding is often greatly reduced. Therefore, such people must have their blood pressure controlled in advance, below 130/80 mmHg and at least not more than 140/90 mmHg.