With the rapid development of China’s economy and the continuous improvement of living standards, especially with the implementation of the basic national policy of the one-child policy, paying attention to the quality of births is an issue that should concern the whole society, and has a profound impact on every family. As a family preparing for the birth of a new life, how to ensure the eugenics is a top priority, but not much is known about the relationship between the oral health of the mother-to-be and eugenics. Often, friends and patients come to consult on how to maintain oral health during pregnancy and the importance of oral health care for pregnant women are the main topics. From the perspective of clinical practice, good oral health care for pregnant women is beneficial to their own health as well as to the development and growth of the next generation, which can be considered a multi-benefit. The following focuses on the oral diseases that pregnant women are prone to, the influence on fetal development and how to carry out oral health care. Common oral diseases of pregnant women Dental caries: There is a folk saying that “a child loses a tooth”, although the saying is a bit exaggerated, but it is enough to show that pregnancy has a great impact on women’s teeth. Especially in the early stage of pregnancy, there will be pregnancy reaction, easy to vomit when eating or brushing teeth, this physiological change makes some pregnant women relax the requirements of oral hygiene. In addition, the increase of eating frequency, snacking and preference for sweet and sour food after pregnancy will easily cause the increase of oral acidity and lead to the decalcification of teeth, so that the caries will easily occur during pregnancy for women who do not have caries, and the number of caries will increase after pregnancy for those who have caries before pregnancy. It is reported that the caries rate of pregnant women in China is more than 80%, but the consultation rate is only 6.81%. Gingivitis: According to the data, the incidence of gingivitis in the population is about 70-80%, and the incidence of pregnant women is even higher. This is due to the endocrine disorder caused by pregnancy, which results in a large increase in the level of estrogen, mainly progesterone, causing capillary dilation, distortion and microcirculation stagnation in the gingival tissue, resulting in edema, easy bleeding and tooth pain, called “gingivitis during pregnancy”. Pregnant women who already have gingivitis before pregnancy will have worse symptoms, and some will develop small lumps the size of a soybean to a thumb (gestational gingival tumors), or even periodontitis, resulting in loose teeth. Pregnant women with oral diseases on fetal development growth and development restrictions: pregnant women need to take in enough nutrition to ensure the normal development of the fetus. However, the presence of oral disease often makes pregnant women irritable, plus dental disease affects the full chewing of food, preventing the digestion and absorption of food, which directly affects the supply of nutrients to the fetus, thus causing the fetal growth and development to be affected. Affect the development of fetal teeth: it is generally believed that the growth of baby teeth begins 6 months after birth, but in fact, the development of dental embryos begins as early as 7-8 weeks of age. If a pregnant woman suffers from oral disease, it will affect the intake of various nutrients, including vitamins A, C, D and minerals such as calcium and phosphorus, which are needed for the development of fetal dental embryos, thus preventing the normal formation and calcification of fetal dental embryos and directly affecting the healthy development of fetal teeth after birth. Pregnant women are often nervous because of the pain caused by moderate or severe dental disease, which not only damages their own health, but also causes miscarriage and premature delivery in early and late pregnancy, and even fetal malformation. It has been reported that pregnant women with moderate or severe periodontitis are more likely to give birth to premature low birth weight babies, and their preterm birth rate is 7.5 times higher than that of normal pregnant women, which is even greater than that of pregnant women who smoke or drink alcohol. The reason is that the endotoxin produced by the bacteria can stimulate the body to produce a large amount of tumor necrosis factor and prostaglandins, which can enter the bloodstream and have a toxic effect on the fetus. Pregnant women’s oral health care points Pre-conception oral health care points: because the safe period of oral treatment for pregnant women is very short, only 4-6 months after pregnancy (the first 3 months of pregnancy is easy to induce miscarriage, the last 3 months of pregnancy is easy to cause premature birth), women who are ready to conceive should go to the regular hospital dental specialist for a comprehensive oral examination and oral health care treatment before conception, in order to maintain oral health and eliminate worries. Pre-pregnancy oral health care includes ① treatment of decayed teeth. ②Treatment of periodontal disease. ③Cleaning of teeth. ④Extraction of teeth that cannot be retained, residual roots and crowns, and recurrent inflammation of blocked teeth (tight-rooted teeth). ⑤Removal and restoration of poorly restored dentures. ⑥Comprehensive restoration of missing teeth to restore chewing function. Precautions for oral health care during pregnancy: ①. Insist on carefully and effectively brushing your teeth in the morning and evening for 3-5 minutes each time, rinse your mouth after meals, and learn to use dental floss regularly to clean the adjacent surfaces of your teeth. Because of the increased sensitivity of oral tissues during pregnancy, use a health care toothbrush with small head and soft bristles when brushing teeth, and replace it once every three months, and use toothpaste containing fluoride or one with bacterial inhibition to prevent caries. ②, usually do percussion exercise and massage the gums to improve the blood circulation of periodontal, which is beneficial to oral health and can also be used to make minor gingivitis heal naturally. ③, pay attention to nutrition, balanced diet, eat more fresh fruits and vegetables rich in vitamin A, C and D, and eat less sweet starchy snacks, which can not only reduce the chance of tooth decay for pregnant women, but also improve the anti-cavity ability of the fetus after birth. It is recommended to have regular oral health checkups every 3 months, and if you feel that you have oral diseases, you should consult the doctor at any time and deal with them promptly.