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Every toothbrush tested shed plastic. The cheapest averaged 39 particles a day.
You filtered the water and swapped the containers. Then researchers measured the one object you scrub inside your mouth twice a day. Here is what they found, and the one part of it you can control.
You already did the hard parts.
The plastic containers went to the donation box years ago. You filter the water. You read ingredient labels like a lawyer reads a contract, and your friends tease you for it, and you keep doing it anyway.
Then you brush your teeth. Two minutes in the morning. Two minutes at night. Same as everyone.
The assumption almost everyone makes
Here is the sentence most people would say if you asked them about their toothbrush:
That sentence feels obviously true. It is also the sentence this article is going to take apart, because a research group finally tested it.
So what does a plastic-free sonic toothbrush look like?
Briut Pure Sonic uses 100 percent natural horsehair bristles, with 40,000 sonic movements a minute.
Your bristles are petroleum
Nearly every toothbrush bristle on the market is nylon, a polyamide made from crude oil. The oil gets refined, the polymer gets melted and pushed through a die into one long filament, and that filament is chopped to length and stapled into a moulded head. Some brands use polybutylene terephthalate instead, which comes from the same place.
You will not find any of this written on the product. There is no ingredient list on a toothbrush. The packaging covers softness, battery life and which dental association signed off. The material of the one part that goes in your mouth is the only thing it leaves out.
"Plant-based" does not mean plastic-free. Bristles sold as castor oil or plant-based are a bio-based nylon, usually PA11. The feedstock is agricultural rather than fossil, which is a real environmental gain and worth something. The filament is still a polyamide. McGill University's Office for Science and Society reckons that calling those bristles castor beans holds up "about as much as cars being made from soil."
The test
In 2025 a research group mounted commercial toothbrushes against a model dental arch, ran a normal twice-daily brushing routine, and counted what came off.
microplastic particles a day, from the cheapest brush in the test
Every brand they tested shed plastic. Particles ranged from 8 to 1,995 micrometres, and the polymers were nylon and polybutylene terephthalate. Microchemical Journal, 2025, and the authors call their own work preliminary.
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Why brushes shed, and why the industry already knew
Think about why you are told to replace your toothbrush every three months.
The official reason is that worn bristles clean less well. True. But sit with what "worn" means for a nylon filament. The material does not evaporate. It does not dissolve. Wear means the filament loses mass, particle by particle, under pressure and friction, twice a day, in a wet environment.
The replacement schedule is the industry quietly telling you the bristles degrade with use. The material that degrades has to go somewhere. A sink drain catches some of it. The rest is in play.
So the shedding finding should not really surprise anyone. A nylon bristle wearing down is a nylon bristle shedding. The 2025 study just counted it.
What the medical literature says
To be clear about what is and is not known. Microplastics have been detected in human blood, in work published in Environment International in 2022. A 2024 New England Journal of Medicine study found polyethylene in the carotid artery plaque of about 58 percent of 257 patients, and that group showed roughly 4.5 times the composite rate of heart attack, stroke or death over about 34 months. That study is observational. It shows association, and association is not proof of cause.
In February 2025, Nature Medicine published measurements of plastic in human brain tissue. Samples from 2024 averaged about 4,917 micrograms per gram against 3,345 in samples from 2016, a rise of roughly 50 percent in eight years. Brain concentrations ran 7 to 30 times higher than liver and kidney.
Documented effects of micro and nanoplastic exposure
- Oxidative stress and reactive oxygen species generation
- Mitochondrial dysfunction
- DNA damage and chromosomal aberrations
- Release of the inflammatory cytokines IL-6 and TNF-alpha
- Disruption of the oral microbiome, with fewer beneficial bacteria
Recorded in cell and animal studies. Journal of Functional Biomaterials, 2025. The same review says directly that causal links to disease have not been established in humans and that the human evidence is still limited.
None of this proves that a toothbrush harms you, and this article will not claim it does. What has stopped being debatable is simpler: human tissue is not supposed to contain plastic, researchers keep finding it in more places, and bristles shed in the one place you scrub on purpose twice a day.
The part you can actually control
Most exposure routes are not really yours to manage. You are not filtering every room you walk into, and the municipal water supply was never going to take your call.
The bristle material is a choice. It has always been a choice. Manufacturers chose nylon because it is cheap and uniform, and buyers never asked, because a toothbrush is a toothbrush.
Among bristle materials in real use, boar and horsehair are the two that are not synthetic polymers. Both predate plastic by centuries. Horsehair is the finer of the two.
Bristle diameter, drawn to scale
Horsehair sits entirely below the range of the softest nylon bristle sold. A nylon filament gets cut and then rounded in a second operation, which is why it loses that rounding as it wears. A hair is already tapered, because that is how it grew.
Shown at matched magnification. Illustration.
The material touching your teeth is a choice.
The brush built to end the trade-off
Until recently, choosing natural bristles meant choosing a manual brush and giving up sonic cleaning. That was the trade that kept people on nylon.
That trade is why the Briut Pure Sonic exists. As far as we can find, it is the only sonic toothbrush where the material touching your teeth is not a polymer. The bristles are 100 percent natural horsehair, a keratin fibre in the same protein family as your own hair, rather than a filament the 2025 study watched come apart. The handle is cut from whole bamboo stalk. The motor drives 40,000 vibrations a minute across 5 modes, with a 2-minute timer that pulses every 30 seconds. A charge lasts about a month, it is IPX7 waterproof, and it ships with 3 replacement heads worth $27.99, a 1-year warranty and 30 days to send it back.
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What you now know that you did not
A toothbrush is not just a toothbrush. The bristle is the actual product, the bristle is almost always petroleum, wear is shedding, and the replacement schedule was the tell sitting in plain sight the whole time.
And the material is a choice. There is exactly one sonic brush we could find where that choice is not a plastic. You found it in an article, the way most of its owners did.
Verdict
The only complete sonic toothbrush we could find with no synthetic filament anywhere on the brushing surface. You pay a premium over a drugstore brush and you accept an animal-derived material. If the bristle material is the reason you read this far, the Pure Sonic is designed specifically around that requirement.
Buy it ifthe bristle material is what brought you here, you already use a sonic brush and do not want to go back to manual, or you would rather make one decision now than think about it again for a year.
Do not buy it ifyou are vegan, you want the cheapest brush that cleans, or you need the research settled before you change anything. On that last one, the honest answer is that it is not settled and will not be for years.
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Common questions
Are the bristles really free of plastic?
Yes. 100 percent natural horsehair, with no nylon or synthetic filament on the surface that touches your teeth.
How long does a horsehair head last?
The same three months as any brush head, and for the same reason: worn bristles clean less well. The difference is what the wear consists of. Three heads come in the box, which covers most of a year.
Does the 39 figure apply to every brush?
No. That was the average for the least expensive brand in the 2025 sample, measured per day across twice-daily brushing. Every brush they tested shed something, and the amount varied with bristle shape and polymer.
Has any of this been proven to harm people?
No. The effects listed above come from cell and animal studies. Human evidence on health outcomes is limited, and the review that collected the findings says so itself.
What are the 5 modes?
Clean, White, Polish, Gum Care and Sensitive. Most people live in Clean or Sensitive.
How often does it charge?
About once a month with twice-daily use.
Is it vegan?
No. Horsehair is an animal material. Briut sources it as a byproduct, and no animal is raised or harmed for bristles.
What if I hate it?
Thirty days, money back. The 1-year warranty covers the device after that.
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Sources
Leslie HA, et al. Discovery and quantification of plastic particle pollution in human blood. Environment International 2022;163:107199.
Marfella R, et al. Microplastics and nanoplastics in atheromas and cardiovascular events. New England Journal of Medicine 2024;390:900-910.
Nihart AJ, et al. Bioaccumulation of microplastics in decedent human brains. Nature Medicine 2025;31:1114-1119.
Preliminary results on microplastic release from commercial toothbrushes during simulated brushing. Microchemical Journal 2025;114680.
Di Spirito F, et al. Micro- and nanoplastics and the oral cavity. Journal of Functional Biomaterials 2025;16(9):332.
Plant-based toothbrush. Really? McGill University Office for Science and Society.
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