The journal microbiome conducted research and found that French kiss which took place in ten seconds can spread 80 M of bacteria on couple mouth.
That seems astonishing and scary, but this bacteria may be useful for people body.
The science research in Netherland requested 21 couples to participate in the study in order to check whether the French kiss is good or not.
They swabbed the couple’s mouth and left them kissing each other for ten seconds, then they collected the saliva.
The interesting thing is that they have found couples who kiss each other for an extended amount of time have the same saliva.
On the other hand, strangers who kiss each don’t have the same saliva, the professor Remco Kort says.