If a pregnant woman’s tooth cavity is painful and rotten to the nerve, it is considered to be deep caries and may be secondary to pulpitis, so it is suggested to go to a regular hospital immediately for relevant examination and treatment. If treatment is not given in time, on the one hand, the pain will cause obstacle to chewing and affect the eating of pregnant women, resulting in reduced nutritional intake, which may not meet the nutritional needs of pregnant women and fetus and affect the normal development of fetus; on the other hand, if pulpitis is secondary, the inflammation stimulation and physical discomfort may increase the risk of pregnancy complications and affect the safety of pregnant women and fetus. In addition, for the consideration of medication safety during pregnancy, the clinical treatment for patients suffering from deep caries or pulpitis during pregnancy is usually based on conservative treatment with pulp opening and drainage, soothing and analgesic. After a simple assessment by the doctor, routine dental examination and filling treatment can be performed during pregnancy, and clinical operations are usually performed in the middle of pregnancy to help pregnant women to pass the pregnancy period safely. Dental operations should be avoided in the first 3 months of pregnancy and in the late 3 months of pregnancy to avoid miscarriage or premature delivery. Pregnant women need to pay attention to oral hygiene to avoid continued worsening of symptoms, clean their teeth properly, ensure at least daily brushing in the morning and before bedtime, ensure brushing for 3 minutes each time, and avoid eating again after brushing before bedtime. If conditions allow, it is also recommended to brush or rinse your teeth after meals to avoid food residues remaining in the mouth leading to bacterial growth. Usually you can eat more vitamin-rich fruits and vegetables to ensure the supply of nutrients and help reduce the occurrence of oral diseases.