11/07/2025
A recent meta‑analysis brought together 35 studies involving over 2.5 million pregnant women to explore whether periodontal disease is linked to low birth weight and preterm delivery. What emerged was a moderate association between gum disease and babies born under 2,500 g—mothers with periodontitis were roughly two and a half times more likely to have low birth weight babies. In case–control studies, which compare mothers with and without affected infants, the likelihood was even higher—almost four times greater . The link with preterm birth (babies delivered before 37 weeks) was weaker, about 1.9 times the risk, and the results varied more between studies .
However, the study’s authors urge caution: the quality of the included research ranged widely, some had small sample sizes, and there was evidence of publication bias—meaning studies with stronger findings were overrepresented . Even after adjusting for these factors, the association with low birth weight weakened but did not disappear. Ultimately, while we can’t say for certain that gum disease causes these pregnancy issues, the evidence suggests that poor oral health can meaningfully raise the risk, particularly for low birth weight. As dental professionals, we can explain to expectant mothers that maintaining healthy gums isn’t just about teeth—it’s a step toward safer pregnancy outcomes.
🔗Read full study: Link in the comments
