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Your Plastic Electric Toothbrush Head Is Giving You 2.3 Million Microplastics A Year, Straight Into Your Body
If you use an electric toothbrush and have never looked at what the head is actually made of, there are a few things you should know before you click the next one on.
By Megan Harper✓Wellness Editor
17 August 2026
You bought an electric toothbrush because it cleans better than your hand. Nobody checks what the head clicking onto it is made of.
It is nylon, in a hollow plastic housing. And plastic bent back and forth thirty thousand times a minute does what plastic does.
The bristles are plastic, and they are shedding
A 2025 study in Ecotoxicology and Environmental Safety measured roughly 3,000 microplastic particles per session. Twice a day, that is 2.3 million a year.
And that was a manual brush. A sonic motor does not slow it down.
The location matters more than the number. Gum tissue is among the most absorbent surfaces on the body.
The "eco" alternative is nylon too
Most people then find heads advertised with castor oil bristles. That castor oil is converted into nylon-11.
The feedstock changed. The material did not. It still frays and sheds like nylon under a sonic motor.
Those particles do not pass through
They do not simply pass through. Microplastics have been found in human arteries, brain tissue and breast milk.
A 2024 study followed people with microplastics in arterial plaque. Over three years they had a 4.5 times higher risk of heart attack, stroke and death.
Most sources of microplastic exposure are effectively impossible to avoid. The one you click onto your handle is not one of them.
And the head itself is a wet plastic cavity
Click-on heads are hollow, and that hollow sits wet for weeks. You cannot see inside it or clean it.
The plastic is petroleum-derived, which is where BPA, phthalates and PFAS come in. All three are endocrine disruptors, and sonic vibration accelerates how fast they leach.
None of this is an argument against electric toothbrushes. The motor is genuinely better than your hand. The problem is the part you throw away every few months anyway.
Not nylon-6, not nylon-11. PRIMALS bristle is keratin.
➞ Get The PRIMALS Natural-Bristle Heads 60-day satisfaction guarantee • 4 heads per pack
What people are switching to instead
The fix is a head that was never plastic. That did not exist until recently, because nylon is cheap to machine and natural bristle is not.
PRIMALS built one anyway: real boar bristle hand-woven into bamboo, with no glue anywhere in the head. Boar bristle is keratin, the same protein as hair.
Conventional heads staple nylon tufts into wells of synthetic glue, then seal it inside a housing that soaks in water twice a day. These are woven by hand, so there is no glue and no hollow cavity.
The bamboo is heat-carbonized, which is why it dries between brushes instead of breeding what a wet plastic shell breeds. Boar bristle is naturally antimicrobial on top of that.
You were going to buy a new head anyway. This one just is not made of plastic.
PRIMALS Boar Bristle Replacement Heads (4 Pack)
- 🐗Real boar bristles. Hand-woven into bamboo. Protein, not petroleum.
- 🔧Built for the PRIMALS Electric Toothbrush. Also fits most click-on handles.
- 🌿Zero microplastics. No nylon, so nothing sheds.
- 🧬No BPA, phthalates or PFAS. And no toxic glue in the head.
- 🛡️Naturally antimicrobial. Heat-carbonized bamboo dries instead of molding.
- 📦4 heads per pack. Replace every 1 to 3 months. Subscribe and forget it.
60-day satisfaction guarantee • Free shipping on $100+ • Free gifts with every bundle
How it compares
What people said after switching
It now holds a 5.0 rating across 203 verified reviews. A few of their comments are below.
Best tooth brush in the game. Primals for the win. F microplastics.
Perfect natural bristle heads for electric brushes.
Best replacement heads I've found.
1M+ people have already switched.
➞ Switch To PRIMALS Now 60-day satisfaction guarantee • Free shipping on $100+Questions readers have asked
They fit the PRIMALS Electric Toothbrush and most click-on handles. If your current head clicks onto the metal drive shaft without twisting, it fits. They do not fit screw-on handles or any non-click-on handle.
Two things. The nylon bristles shed microplastics, up to 3,000 per use, and they absorb through your gums into your bloodstream. And the plastic itself can carry BPA, phthalates and PFAS, which sonic vibration only helps release faster.
Not really. Castor oil bristles are nylon-11, a plastic filament made from a plant feedstock instead of petroleum. The source changed, the material didn't. It still frays and sheds into your mouth the same way.
Boar bristle is firm, but it isn't harsh like plastic. It's naturally tapered, so it flexes and spreads pressure instead of scraping like stiff nylon. If you want softer, our horse bristle heads are the softest natural bristle available and fit the same handle.
Every 1 to 3 months, or sooner if the bristles fray, flatten or split. Each pack comes with 4 heads, and you can subscribe for automatic delivery so you never run out.
Yes. A few bristles may come loose in the first week or two while the bamboo adjusts to your bathroom's humidity, and it settles down. Leave a 0.5 to 1mm gap between the head and handle for proper vibration transfer, and stand the brush upright to dry.
Look at the bristles. The vast majority still use nylon. Since the bristle is the only part that contacts your mouth, a bamboo base changes nothing on its own. PRIMALS uses bamboo plus actual boar bristle, natural keratin from top to bottom.
Orders ship quickly with tracking and same-day human email support. If anything is ever off, we make it right.
Keep the handle. Lose the plastic.
➞ Switch To PRIMALS Now60-day satisfaction guarantee • Free shipping on $100+