Dental nerve killing drugs, as long as used in accordance with medical advice, generally have no effect on pregnant women. At present, the clinical use of drugs to kill the dental nerve, mainly paraformaldehyde, the drug can act on the local pulp, so that the blood vessels in the pulp of the blood circulation is impaired, resulting in pulp ischemia and necrosis. The drug is relatively safe, as long as timely follow-up to remove the drug, will not affect the body. Therefore, nerve-killing drugs do not affect pregnant women if they are used topically and followed up on time. Since oral diseases develop rapidly during pregnancy, pregnant women should go to the hospital regularly for oral health checkups and early detection and treatment. At the same time during pregnancy, attention should be paid to calcium supplementation, not only beneficial to the fetus, but also beneficial to the teeth. You should also pay more attention to oral hygiene during pregnancy. It is recommended to follow the doctor’s instructions to treat oral diseases during pregnancy, do not self-medication, so as not to cause serious consequences.