The best time to have a tooth extracted is usually in the morning, as there is almost a full day of observation after the extraction in the morning, whereas if there is more postoperative bleeding, or dizziness and headache, or interstitial infection, this can be dealt with promptly. It should be ensured that the general condition is good, for example, patients with high blood pressure need to ensure that there is a stable blood pressure, and blood glucose should generally be controlled within the normal range, usually not more than 8.88 mmol / L, and then the teeth can be extracted. In the case of heart disease patients, it is recommended that the heart is stable, it is best to be able to be examined in the cardiology department before the disposal of tooth extraction, and not to take hemolytic drugs. Because if the tooth is extracted, there will be a bleeding condition, so you can’t take anticoagulant drugs. In addition, women should not have their teeth extracted during menstruation or pregnancy, and should avoid these times.