In the course of daily clinic, we often come across pregnant women with serious oral diseases, including severe peri-coronitis of wisdom teeth leading to multiple interstitial infections, gingivitis and gingival tumor in pregnancy leading to heavy bleeding in the mouth, apical abscesses due to fear of treatment of dental caries, severe loosening of teeth and formation of multiple periodontal abscesses due to aggravation of periodontitis, and so on. Many pregnant women come to the clinic only when they really can’t hold on, which leads to the aggravation of pain and poor treatment effect and can seriously affect the health of pregnant women and fetus. The oral health of pregnant women is not only related to the oral health of women throughout their lives, but also directly affects the growth and development of infants and children. Studies have found that mild periodontal disease can put the fetus at risk for growth restriction and low birth weight. Such risks are even greater when a pregnant woman has moderate periodontal disease. Pregnant women with periodontal disease have about twice the risk of fetal growth disturbance and are seven times more likely to have a premature baby than those without periodontal disease. A. Why pregnant women are more likely to suffer from oral diseases? During pregnancy, pregnant women eat more often and prefer acidic food, plus their body is often in discomfort, so they often neglect oral hygiene care, which will lead to the increase of plaque on the surface of their teeth, and then lead to dental caries and periodontal disease. Therefore, pregnant women who do not have caries before pregnancy may suffer from caries during pregnancy; pregnant women who have caries before pregnancy will have the condition aggravated after pregnancy; 2, during pregnancy, their endocrine situation has changed, which also increases their probability of suffering from caries and periodontal disease. For example, certain hormones produced in the body of pregnant women during pregnancy will cause the blood vessels in their gums to proliferate, leading to an increase in the permeability of their blood vessels, causing them to develop gum redness and swelling, and this gum redness will gradually increase with the accumulation of plaque, forming gingivitis during pregnancy, and finally this gingivitis can turn into septic granuloma (known as gestational tumor). Some pregnant women with severe periodontitis are at increased risk of preterm delivery and low birth weight babies, which can be a heavy burden on preterm babies and their families. For example, low blood sugar and excessive placental secretion of chorionic gonadotropin may cause acid vomiting in pregnant women, and acid in pregnant women’s mouth may cause decalcification of their teeth, and the corroded teeth may be infected by bacteria to form dental caries. Gingivitis, etc. Pregnant women who already suffered from gingivitis before pregnancy may have their gingivitis symptoms aggravated after pregnancy. Pregnant women with smoking habits, the symptoms of gingivitis are generally heavier, and even periodontal pockets, which can also lead to loosening of their teeth; 4, pregnant women do not brush their teeth due to the influence of old ideas, do not pay attention to oral hygiene, wisdom teeth pericoronitis and not timely treatment, resulting in the spread of inflammation caused by oral and maxillofacial multi-gap infection, serious cases lead to sepsis and other systemic infections and endanger the life of the fetus and the mother. Second, pregnant women to maintain oral health, must start from the following two points: 1, before pregnancy to oral examination and health care treatment. Because the safety period of oral treatment for pregnant women during pregnancy is very short (the best time for pregnant women to treat dental caries and gingivitis is the middle of pregnancy, that is, 4-6 months of pregnancy, for safety reasons, the treatment of oral diseases in early and late pregnancy can be mainly to relieve the pain of pregnant women, and the perfect treatment can continue until the middle of pregnancy or after delivery), so pregnant women should go to the regular hospital for comprehensive oral examination and health care treatment in a hurry before pregnancy. Treatment; 2, during pregnancy to pay attention to oral health care. Third, when to prepare for oral examination before pregnancy? Whether you are pregnant or not, you should have oral examination once every six months, especially for pre-pregnant women, it is best to have oral health examination from 3 to 6 months before pregnancy. Does the radiation index of dental radiographs taken during oral examination affect pregnancy? X-rays are essential for the correct diagnosis and successful treatment of oral diseases. Studies have shown that the amount of radiation received by the uterus during the taking of oral panoramic radiographs is far below the minimum that may cause abnormal embryonic development. The damage to the embryo caused by dental radiation is negligible when 1-4 dental films are routinely taken. However, X-ray exposure should be avoided during the 1st-3rd months of pregnancy and during the 7th-9th months unless it is necessary in an emergency, and X-ray exposure can be performed under protective measures during the 4th-6th months of pregnancy.