Abstract: Periodontal disease，as a source of subclinical and persistent infection，may induce systemic inflammatory
responses that increase the risk of adverse pregnancy outcomes. At present，lots of studies support that the risk of preterm birth，low birth weight and stillbirth is associated with the degree of periodontal disease. Because of the periodontal disease，the risk of pre-eclampsia and gestational diabetes mellitus is increased. Intervention timely and reasonablly may improve the pregnancy outcomes.

Key words: Periodontal diseases, Premature birth, Birth weight, Pre-eclampsia, Diabetes, gestational