Pregnant women with common oral diseases including dental caries, gingivitis, etc., if pregnant women with oral diseases, will bring many adverse effects on fetal development, there will be the following phenomena: 1, 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 diseases often makes pregnant women irritable, plus dental disease affects the full chewing of food, hindering the digestion and absorption of food, directly affecting the supply of nutrition to the fetus, which will make the growth and development of the fetus is affected to some extent. 2, affect the fetal dental development: people generally believe that the baby’s teeth are 6 months after birth only began to grow, in fact, the development of dental embryos as early as 7-8 weeks of age in the embryo began. Pregnant women who suffer from oral disease will affect the intake of various nutrients, including vitamins A, C, D and calcium, phosphorus and other minerals needed in the development of fetal tooth germs, thus preventing the normal formation and calcification of fetal tooth germs, directly affecting the healthy development of fetal teeth after birth. 3, easy to miscarriage and preterm delivery: some pregnant women often because of the pain caused by moderate and severe dental disease and mental stress, which will not only damage the health of pregnant women themselves, but also in the early and late stages of pregnancy will also cause miscarriage and preterm delivery, and even fetal abnormality, due to the security of pregnant women for oral treatment is very short, only 4-6 months after pregnancy (the first three months of pregnancy is easy to induce miscarriage, the last three months of pregnancy), ready to pregnant women to carry out the treatment of the security period is very short, only after pregnancy (the first three months of pregnancy is easy to trigger miscarriage, pregnancy is easy to trigger preterm delivery). (the first three months of pregnancy is prone to induce miscarriage, the last three months of pregnancy is easy to trigger preterm delivery), ready to get pregnant women in the formal hospital before conception should go to the dental specialist to carry out a comprehensive oral examination and oral health care treatment. Pre-pregnancy oral health care includes: treatment of decayed teeth, treatment of periodontal diseases, cleaning of teeth. 1. Remove teeth that cannot be retained, residual roots and crowns, as well as blocked teeth (tightly rooted teeth) that are repeatedly inflamed. 2.Removal of poorly restored dentures and restoration. 3.Comprehensive restoration of missing teeth to restore chewing function during pregnancy should adhere to morning and evening serious and effective brushing, each time brushing 3-5 minutes, rinsing after meals, and learn to use dental floss to clean the adjacent surfaces of the teeth on a regular basis. 4, when brushing teeth to choose a small head, soft bristles of health care toothbrush, replaced every 3 months, toothpaste with fluoride or inhibit the role of bacteria is appropriate, conducive to the prevention of caries. 5, usually often do knocking movement and massage gums, regular oral health checkups, it is recommended that every 3 months to check once, if consciously have oral diseases, should be readily available to the clinic, timely treatment, oral disease treatment is best in the safe period (pregnancy 4-6 months).