A single human mouth can contain more bacteria than there are people on Earth.
Sources
- Fascinating Facts About Your Body - WebMD (webmd.com)
- https://newsinhealth.nih.gov/2026/03/world-inside-your-mouth (newsinhealth.nih.gov)
- https://www.listerine.com/bad-breath/good-vs-bad-oral-microbiome-bacteria (listerine.com)
- https://www.rdhmag.com/infection-control/water-safety/article/16404976/oral-bacteria-how-many-how-fast (rdhmag.com)
- https://www.dentistrytoday.com/mouth-contains-more-germs-than-total-number-of-people-on-earth/ (dentistrytoday.com)
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