A study in the journal Microbiome found that a ten-second French kiss can spread 80 million bacteria between mouths. 80 million may sound scary but these bacteria may actually benefit your body.
Scientific Research in the Netherlands got 21 couples visiting a zoo in the Netherlands to participate in a study on French kissing. Their tongues were swabbed and saliva collected before and after a timed ten-second French kiss.
What was interesting is that they found the bacteria on the tongues of couples were more similar than 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.” – Professor Remco Kort, lead researcher, Netherlands Organisation for Applied Scientific Research.
To find see how similar the shared bacteria were, the researchers did one more test. One person in the couple drank a probiotic yogurt drink containing bacteria called Lactobacillus and Bifidobacteria and wait a bit and couple shared a 10-second, French kiss. Then they took a sample of the bacteria in the mouth of the partner who hadn’t drunk the yogurt. What the researchers found was that the volume of bacteria transferred to the other partner was on average 80 million bacteria!