“Our data suggest that the presence of periodontal disease is a modifiable risk factor, which can increase a woman’s time to conception, particularly for non-Caucasians.”-Roger Hart, University of Western Australia.
An Australian study links clean teeth to increased birth rates. 3,416 women were tracked, and the results suggest that bad oral hygiene in Caucasian women delayed their ability to get pregnant by two months.
The study might be “racist”, but it concluded that non-Caucasian women with gum disease took a full year to get pregnant.
Previous studies have also concluded that men with dirty mouths have a hard time getting women pregnant. I don’t know how serious we should take these studies, because other studies have linked dirty mouths to type 2 diabetes, heart disease and even respiratory problems.