Oct 24, 2025 06:10 PM
https://www.bbc.com/future/article/20251...brush-more
EXCERPTS: Your toothbrush is a disgusting miniature ecosystem. Its fraying bristles form an arid scrubland that each day is temporarily flooded, transforming it into a wetland awash with nutrients. Thriving among the thickets of towering plastic stalks are millions of organisms.
Right now your toothbrush is home to something like 1-12 million bacteria and fungi belonging to hundreds of different species, alongside countless viruses. They form biological films on the exposed surfaces of your brush, or worm their way into the fractured stalks of ageing bristles.
A daily influx of water, saliva, skin cells and traces of food from our mouths give these microbes all they need to thrive. Every so often, they are joined by a shower of other microorganisms that arrive with the flush of a nearby toilet or opening of a window.
And twice a day you put this delightful cocktail into your mouth to give it a good stir around. So, should you be more concerned about how clean your toothbrush is?
[...] These microbes come from the water we rinse our brushes with, our hands and other parts of the "environment". But consider this – that environment is likely to be your bathroom. ... If you happen to keep your toothbrush close by, then the contents of your toilet bowl could well end up settling on to the bristles you later put into your mouth. ... But Erica Hartmann, an associate professor of engineering at Northwestern University in Illinois, US, who studies how microbes survive in real-world environments, isn't convinced the toilet plume is as much of a concern as some fear.
[...] There is a bewildering array of techniques for sterilising toothbrushes ... Pedrazzi recommends disinfecting brushes with a mouthwash solution containing either 0.12% chlorhexidine or 0.05% cetylpyridinium chloride... (MORE - missing details)
EXCERPTS: Your toothbrush is a disgusting miniature ecosystem. Its fraying bristles form an arid scrubland that each day is temporarily flooded, transforming it into a wetland awash with nutrients. Thriving among the thickets of towering plastic stalks are millions of organisms.
Right now your toothbrush is home to something like 1-12 million bacteria and fungi belonging to hundreds of different species, alongside countless viruses. They form biological films on the exposed surfaces of your brush, or worm their way into the fractured stalks of ageing bristles.
A daily influx of water, saliva, skin cells and traces of food from our mouths give these microbes all they need to thrive. Every so often, they are joined by a shower of other microorganisms that arrive with the flush of a nearby toilet or opening of a window.
And twice a day you put this delightful cocktail into your mouth to give it a good stir around. So, should you be more concerned about how clean your toothbrush is?
[...] These microbes come from the water we rinse our brushes with, our hands and other parts of the "environment". But consider this – that environment is likely to be your bathroom. ... If you happen to keep your toothbrush close by, then the contents of your toilet bowl could well end up settling on to the bristles you later put into your mouth. ... But Erica Hartmann, an associate professor of engineering at Northwestern University in Illinois, US, who studies how microbes survive in real-world environments, isn't convinced the toilet plume is as much of a concern as some fear.
[...] There is a bewildering array of techniques for sterilising toothbrushes ... Pedrazzi recommends disinfecting brushes with a mouthwash solution containing either 0.12% chlorhexidine or 0.05% cetylpyridinium chloride... (MORE - missing details)
