Here’s How Many Bacteria Spread Through One Kiss

TIME

First base is a great place to get your mouth microbes some new friends, finds a new study in the journal Microbiome. A ten-second French kiss can spread 80 million bacteria between mouths.

Study author Remco Kort, a professor and scientist at Netherlands Organisation for Applied Scientific Research (TNO), asked couples visiting a zoo in the Netherlands if they wanted to participate in a study on French kissing. 21 couples agreed and had their tongues swabbed and saliva collected, both before and after a kiss.

Researchers discovered that the bacteria on the tongues of couples was much more similar than the oral bacteria of two strangers. “Apparently, being with somebody for an extended amount of time and having a relationship leads to a similar collection of bacteria on the tongue,” Kort says.

In order to find out just how similar the shared bacteria were, one person in the couple…

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