From obesity to autism, there’s no shortage of health disorders that have been linked to the bacteria that naturally inhabit our bodies, and the latest suspect is cavities in our teeth. In a new study in Cell Host and Microbe, researchers compared groups of fraternal and identical twins to see whether genetics plays a role in forming the assortment of bacteria that live in our mouths. The news is bleak if you’re looking for something to blame your cavities on other than bad brushing or a sugary diet: Although twins had similar compositions of mouth microbes, they weren’t any more likely to have the cavity-causing species. In fact, as kids grew older, the study showed that the similarities in bacterial populations declined, regardless of how they were related, The Economist reports.
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