Tooth extraction is something that many people encounter in their lives. Sometimes, we have to figure out what exactly are the contraindications of tooth extraction if we want it to be very effective. These are the things we must know about tooth extraction. So, what are the specific contraindications that we should know about tooth extraction?

　　Menstrual period can not be extracted: women's menstrual period, tooth extraction may cause haemorrhage, pregnancy extraction may induce premature birth or even miscarriage; extraction is traumatic surgery, the body's resistance is weak when suffering from a cold, extraction may cause postoperative infection; in general, in the period of acute inflammation, can not be extracted, but this is not a generalisation, part of the inflammation can be extracted through the drainage of the tooth to alleviate the symptoms, which requires a professional doctor to judge.

　　Some patients with systemic diseases, such as diabetes, heart disease, high blood pressure, etc., must be when the condition is controlled within a safe range before extraction, hyperthyroidism, hepatitis, nephritis patients, as well as the elderly, should also be necessary examination and treatment before extraction.

　　Time choice for tooth extraction. The human body's perception of pain is more sensitive in the morning than in the afternoon, and there is a saying that tooth extraction should be arranged in the afternoon. In my opinion, this kind of preaching is not necessary. Anaesthesia will be used for tooth extraction, and the anaesthesia used nowadays is so effective that it basically ensures that there is no pain during the procedure.

　　If the tooth is extracted in the morning, when the anaesthesia wakes up, it is almost in the afternoon, when the human body is not so sensitive to pain, is it not better? Therefore, it does not make a big difference whether the tooth is extracted in the morning or in the afternoon. However, if the extraction is arranged in the morning, ensure the quality of breakfast and avoid extraction on an empty stomach to avoid hypoglycaemia caused by stress. You should have enough rest before the extraction to ensure that you have plenty of energy and stamina, and avoid extraction when you are physically tired.

　　Don't spit after tooth extraction: After tooth extraction, not everything is fine. To avoid bleeding and infection after tooth extraction, you need to pay attention to some details. You can gently bite a cotton ball or gauze ball to stop bleeding for 30 to 40 minutes.

　　You cannot eat or rinse your mouth for two hours after tooth extraction. After two hours, you can eat some semi-liquid food, don't eat too hot, too hard food, also avoid spicy, stimulating food, eat more vitamin-rich fruits and fruit juices, supplemental nutrition, promote wound healing, pay attention to chewing with the non-surgical side.

　　After tooth extraction, there is blood in the wound, and the mouth will retain a bloody taste, so some people can't help but spit. This is a small action that should be prohibited. The sucking action before spitting tends to make the wound bleed and affects the coagulation of the blood clot. You can't brush your teeth on the day of tooth extraction to avoid damaging the wound.

　　Twenty-four hours after tooth extraction, slight pain and pink blood or blood mixed in the spit are normal, and anti-inflammatory and analgesic medicines can be taken under the guidance of the doctor. The pain and bleeding will become lighter and less frequent. If there is still persistent bleeding or pain after a few days, or even obvious dizziness and panic and other uncomfortable symptoms, seek timely help from your doctor.

　　Apart from wisdom teeth, other teeth should be reviewed and repaired in time about three months after removal, otherwise it will cause the neighbouring teeth to tilt and the opposite teeth to elongate, disrupting the normal occlusal relationship.