Periodontal disease is mainly caused by anaerobic bacterial infections. The bacteria themselves and other metabolites are released as inflammatory factors when the gums become inflamed, which may lead to poor blood glucose metabolism and even premature delivery in pregnant women; in addition, pregnant women have difficulty eating due to toothache, which may lead to nutritional imbalance and indirectly affect the health of the fetus. In 1996, the American Academy of Periodontology published a study that pregnant women with severe periodontal disease are seven times more likely to have miscarriage, premature birth or low birth weight than pregnant women with good oral health. This is why pregnant mothers should not take it lightly.