Toothache in pregnant women may be caused by tooth decay, pericoronitis of wisdom teeth, and pulpitis and periapical inflammation. Therefore, it is recommended to have a comprehensive oral examination during pregnancy preparation and remove the teeth that may cause toothache as soon 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 do not leave food residue. 1.Caries: pregnant women with caries themselves are not treated in time, and the caries cavity deepens further during pregnancy, or pregnant women do not have caries themselves, but the diet contains high sugar or oral cleaning is not serious during pregnancy, resulting in food residue in the mouth causing caries, which will cause tooth pain; 2.Wisdom teeth Pericoronitis: the blocked wisdom teeth are not easy to clean when brushing, and the hormone level of women changes during pregnancy, which will easily cause inflammation of wisdom teeth and eventually cause pain; 3, pulpitis and periapical inflammation: the dental nerve has inflammation, and the acute inflammation will cause obvious pain. Toothache during pregnancy is relatively dangerous in the first and second trimesters of pregnancy and can be considered for symptomatic pain relief through oral cleaning or icing. In the middle trimester when it is relatively safe, consider consulting a dentist to take further treatment.