Dr. McGlennen: The oral microbiota changes when women become pregnant, and levels of periodontal pathogens increase1. During pregnancy, periodontal inflammation worsens, mostly due to increased levels of A.a., P.g., F.n. and P.i.2. Among these oral pathogens, there is a marked risk of infection of the maternal blood and the placenta, which leads to an increase in pre-term labor, lower birth weight and even the chance of fetal loss due specifically to the bacteria P.g. and F.n.3,4. Further, the...