washingtonpost.com – So, kissing seems all fine and great, but just get science involved and, boom, we learn that it’s actually pretty gross. To be fair, our mouths are kind of disgusting to begin with: They play host to entire communities of bacteria (700 varieties!), which are part of an ecosystem of bacteria, or microbiome, that help digest and break down food. Factors including genetics and diet influence the makeup of that bacteria But researchers in the Netherlands wondered:

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