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A Single Kiss Can Transfer Tens of Millions of Bacteria, Scientists Say
A simple kiss may feel harmless, even romantic, but scientists say it can involve the transfer of tens of millions of bacteria between two people in just a matter of seconds.
According to research into the human oral microbiome, an average mouth contains more than 700 different species of bacteria. While many of these microbes are beneficial and help with digestion and immune defence, others can contribute to tooth decay, gum disease and infections. When two people kiss—especially a prolonged, open-mouth kiss—large quantities of saliva are exchanged, allowing bacteria to move easily from one mouth to another.
Studies estimate that a 10-second kiss can transfer up to 80 million bacteria between partners. Researchers have found that couples who kiss frequently tend to have more similar oral bacteria than those who do not, showing how quickly and effectively microbes can spread through intimate contact.
Despite how alarming the number sounds, scientists stress that this bacterial exchange is usually not dangerous. In fact, exposure to a partner’s bacteria can help strengthen the immune system by introducing new, harmless microbes. Problems are more likely when one person has poor oral hygiene or an active infection, such as gum disease, cold sores, or certain viruses, which can be passed on more easily through saliva.
Dentists recommend maintaining good oral health to reduce risks. Regular brushing, flossing, and dental check-ups help control harmful bacteria levels and lower the chance of transmitting oral infections through kissing.
Experts also note that kissing has well-documented benefits. It releases hormones like oxytocin and dopamine, which reduce stress, strengthen emotional bonds, and improve overall wellbeing. For most people, the health benefits far outweigh the microbial risks.
In short, while a kiss can swap tens of millions of bacteria, it is usually a natural and harmless part of human interaction—and one that plays a role in both emotional and biological connection.
Attached is a news article regarding ten of million of bacteria can be swapped between two people over one deep kiss via the tongues
https://www.hunimed.eu/news/80-million-bacteria-exchanged-kiss/
Article written and configured by Christopher Stanley
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