Join Date: Mar 2006
Location: unemployed in Greenland
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It's because of bacteria and the fact that the gums and tongue are a portal for disease to enter the bloodstream (moreso than, say, your finger.) Infection is a major cause for premature rupture of membranes, which obviously can lead to preterm birth.
Poor dental health is a risk factor for heart disease for the same reason. Bacterial endocarditis is one concern, also some bacteria can contribute to plaque-y buildup in the arteries.