Kissing bacteria: 80 million microbes may be transferred in a 10-second kiss (VIDEO).

When You Kiss Someone, You’re Exchanging a Lot More Than Passion

When You Kiss Someone, You’re Exchanging a Lot More Than Passion

The state of the universe.
Nov. 21 2014 12:16 PM

What Happens in Your Mouth When You Kiss?

The microbe ecosystem of making out.

kissingscenefromnotorious

When two people lock into a passionate kiss, what’s going on in their mouths? As the video above shows, you share a lot more than passion with your partner during a 10-second kiss.

We recommend you watch this video full screen. 

Paca Thomas is a regular video contributor to Slate.

Jeffrey Bloomer is Slate's senior video producer.