The toothache of pregnant women may be caused by tooth decay, wisdom tooth pericoronitis, or pulpitis and periapical inflammation, etc. The cause should be clarified according to the specific pain nature and medical history, and then be treated accordingly. 1.Tooth decay: pregnant women have tooth decay without timely treatment, and the cavity further deepens during pregnancy, or pregnant women do not have tooth decay, but the diet contains high sugar or oral cleaning is not serious during pregnancy, resulting in food residue in the mouth It will cause toothache if tooth decay is caused. Generally, there is no spontaneous pain in caries, but it can be shown as pain when eating or hot and cold stimulation; 2, wisdom tooth pericoronitis: the wisdom tooth is not easy to clean when brushing, and the hormone level of women changes during pregnancy, which can easily cause wisdom tooth inflammation and eventually cause toothache. The initial symptoms are not obvious and can be swelling and discomfort, followed by a gradual increase in pain, manifested as swallowing pain, eating pain, which can radiate to the jaw and face; 3. Pulpitis and periapicalitis: If there is inflammation of the dental nerve, acute inflammation can cause significant pain, especially acute pulpitis pain is very intense and unbearable. There are greater risks for women to have wisdom teeth or cavities extracted during pregnancy, so it is recommended to have a comprehensive oral examination during the preparation of pregnancy and have the teeth that may cause toothache extracted as early as possible. At the same time, pay attention to oral cleaning during pregnancy, brush or rinse your teeth in time after eating, clean your teeth thoroughly and leave no food residue behind.