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This is Scientific American 60-Second Health. I'm Dina Fine Maron. Got a minute?

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A passionate kiss shares much more than intimacy.

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A single 10-second smooch can transfer tens of millions of bacteria from one partner to the other.

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That's the finding from a study in the journal Microbiome.

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More than 700 different bacteria are estimated to live in the human mouth.

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To find out how macking mixes microbes, Dutch scientists asked 21 couples to French kiss.

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Intimate partners already have more of the same bacteria in their mouths than do unrelated individuals,

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because of the couple's shared habits and environment.

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But kissing really expedites the bacterial blending.

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As part of the study, one member of the couple consumed a probiotic yogurt drink loaded with certain bacteria.

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Saliva samples and tongue swabs revealed that after the couples puckered up,

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about 80 million bacteria from the drink moved mouth-to-mouth.

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The salivary bug exchange was extensive but the work does not yet tell us why certain swapped bacteria either stuck around or were more transient.

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Answering that question could help with future medical interventions aimed at microbes.

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What the research did show: although the bacteria in saliva were easily altered, bacteria living on tongues tended to stay put.

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Unlike certain frog-princes, those critters were less prone to change because of a mere kiss.

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Thanks for the minute, for Scientific American 60-Second Health. I'm Dina Fine Maron.

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