Bamboo vs Plastic Toothbrush: 97% Less Plastic — and What the Bristles Are Still Made Of

The toothbrush is the most-replaced plastic object in an average bathroom. The American Dental Association advises swapping it every three to four months, which makes it a purchase you repeat roughly four times a year for your whole life, and that repetition is the entire reason the material matters. One brush is trivial. Two hundred and forty of them are not.

Bamboo brushes arrived as the answer, and most of what is written about them is written by the companies selling them. There is a better source. In 2020 a team at the Eastman Dental Hospital in London and the Dublin Dental University Hospital ran a full life-cycle assessment of four toothbrush types over a five-year period — plastic manual, bamboo manual, plastic manual with replaceable heads, and electric — and published it in the British Dental Journal. It is still the only quantitative comparison of its kind, and it answers the plastic question precisely. A second paper, published in 2025, answers a question that study did not ask: what the bristles release into your mouth.

Two honest notes on that table before anything else. The dashes are values the paper did not publish as a single figure for that product, and we have left them blank rather than estimating them — the plastic-mass comparison was published as the bamboo brush’s 11 g and its 97% reduction against the plastic manual, not as a mass for every product. And the replaceable-head plastic brush, which is the result nobody quotes, was lowest in more categories than bamboo: eleven against five. Bamboo is the most visible plastic saving, not the sweep that the marketing implies.

Does a Bamboo Toothbrush Really Use Less Plastic?

It does, and 11 grams over five years is the number to hold onto. That is the entire plastic content of a bamboo brush replaced twenty times — roughly half a gram of nylon bristle per brush, plus the metal staples that anchor it. The study put that at 97% less plastic than the traditional plastic manual toothbrush, which was the lowest plastic figure of all four products.

What that saving actually consists of is the handle. In the plastic manual brush, the polypropylene handle was the single biggest contributor to its whole environmental footprint — 37% of it — and in the replaceable-head version, 33%. Bamboo deletes that component outright. The authors confirmed that no glue is used in the bamboo brush’s manufacture; the handle is shaped and heat-treated to sterilize it.

The paper also ran the arithmetic out to a human lifetime. At a UK life expectancy of 80 years, one person brushing with plastic manual toothbrushes gets through roughly 6.3 kg of plastic. That is the pile a bamboo handle is removing from one bathroom — not a tonnage that changes the ocean, but a real and permanent object that will exist long after the person who brushed with it.

What Are Bamboo Toothbrush Bristles Made Of?

Nylon, on almost every brush sold. This is the sentence that the category tends to skip, and the British Dental Journal authors stated it plainly: all four products in the study used plastic to make the toothbrush bristles, specifically nylon, and all except the bamboo product also used plastic for the handle and the packaging.

The better brands publish it rather than hide it. The Humble Co. lists its bristles as BPA-free nylon-6. Greenzla’s bamboo brushes use BPA-free nylon bristles infused with charcoal. Neither is being deceptive; the bristle is simply the part of a toothbrush that no plant fiber has yet matched for durability, end-rounding and resistance to bacteria.

One real exception exists. Brush with Bamboo states that its bristles are made from 100% castor bean oil and are USDA Certified 100% Biobased, with “0% fossil fuel and 0% petroleum.” That is a genuine difference in feedstock — the carbon in the filament came out of a plant rather than a well. It is not a claim that the filament is not a polymer, and the company is unusually straight about the consequence: it says the bristles are biodegradable but cannot legally be called compostable, because compostable products have to break down as fast as food, and these do not. Their timeline, in the company’s words, “would depend on soil activity.”

The useful takeaway from that table is not that one plastic beats another. It is that bristle material changes how long a brush lasts, and a filament that stays usable for six months instead of three halves the number of brushes a person throws away. That is a bigger lever on total plastic than the handle material, and nobody markets it.

Do Toothbrush Bristles Shed Microplastics Into Your Mouth?

They do, and as of 2025 the quantity has been measured rather than assumed. A team publishing in the Microchemical Journal built a 3D-modeled zirconium dental arch, ran commercial toothbrushes against it twice daily for seven days under realistic brushing conditions, then collected, counted and identified what came off using microscopy, Fourier-transform infrared spectroscopy and micro-Raman spectroscopy.

Every toothbrush released microplastics, regardless of brand. The least expensive brand released the most, at an average of 39 particles per day. The particles were not all one shape — the researchers recovered fragments, fibers, films and pellets — and they spanned a very wide size range, from 8 to 1,995 micrometers. The polymers the authors flagged as the primary risk concern were nylon and polybutylene terephthalate, which are the two materials toothbrush bristles are made from. Bristle shape and material both influenced how much fragmented.

Is an Electric Toothbrush Worse Than a Plastic Manual One?

On this evidence, yes, and not marginally. The electric toothbrush had the greatest environmental impact in 15 of the 16 categories the study assessed — the only exception being water scarcity. Its five-year climate change potential was 0.479 kg CO₂ equivalent, against 0.0422 for the bamboo brush: eleven times higher. Its land use impact, which the authors tie to biodiversity and habitat loss, was more than 36 times the bamboo brush’s.

The interesting part is where that footprint comes from, because it is not where most people assume. Charging the handle accounted for 0.69% of the electric brush’s total impact and disposal for 0.16%. The weight is the problem: at 1.42 kg it was the heaviest product in the study, and transport (47%) plus materials (46%) accounted for almost all of its footprint. Using it more efficiently changes essentially nothing; the damage was done before it reached the bathroom.

Against that sits the clinical evidence, which deserves to be stated fairly. The Cochrane review the authors cite — Yaacob and colleagues, 2014 — found moderate-quality evidence that powered brushes achieve a statistically significant reduction in plaque and in gingivitis compared with manual ones, in both the short and long term. The British Dental Journal authors’ own reading of that same evidence, stated in their paper, is that there is no evidence any type of toothbrush is more clinically effective for the prevention of dental caries and periodontal disease. If an electric brush is what gets a particular person to brush properly for two minutes, that is a real clinical benefit and it outranks a carbon figure. If it is sitting on the counter because it looked nice, the figures above are what it costs. Our guide to non-toxic electric toothbrushes covers the models worth it if you need one.

The Three Bamboo Brushes Worth Buying

Ranked by how much of the problem each one actually solves — which means the bristle, not just the handle.

Best Overall

Brush with Bamboo Toothbrush (4-Pack)

The only widely sold bamboo brush that changes the bristle as well as the handle — a castor-bean-oil filament the company certifies as 100% biobased, on an FSC-certified Moso bamboo handle.

100% Castor Bean Oil Bristles USDA Certified 100% Biobased FSC-Certified Bamboo 4-Pack, Paper Box Only

Verdict: Buy this one if the bristle matters to you, because it is the only pick here where the bristle is not petroleum nylon. Be clear-eyed about what that does and does not mean: a biobased polyamide is still a polymer, and the company says so itself rather than letting you assume otherwise.

The handle is wild-harvested Giant Moso bamboo, FSC certified. The company removed the plastic wrapper from its packaging in March 2019 and ships in a paper box only, which closes the third plastic component the British Dental Journal study identified — the polyethylene packaging that every non-bamboo brush in the study also carried. On disposal, the honest instruction is the same as for any bamboo brush: the head comes off and goes in the bin, the bare handle composts.

Pros

• Bristles are plant-derived, not petroleum nylon
• USDA Certified 100% Biobased — a verified claim, not a slogan
• FSC-certified bamboo handle, no glue in manufacture
• Paper-only packaging since 2019

Cons

• Costs more per brush than a bamboo multipack
• Biobased is not compostable — the company says so
• Bristles still need removing before the handle composts
• Four brushes per pack, so you cannot buy just one

The one bamboo brush that also deals with the part that goes in your mouth.

Why it matters: the 2025 release study named nylon and polybutylene terephthalate as the polymers of primary concern. This is the only pick here whose filament is neither of them.

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• USDA BioPreferred certified

Best Everyday Pick

The Humble Co. Humble Brush (5-Pack)

A dentist-founded bamboo brush that publishes exactly what its bristles are made of — BPA-free nylon-6 — instead of leaving you to guess.

100% Bamboo Handle BPA-Free Nylon-6 Bristles Free From PFAS and PTFE 5-Pack

Verdict: The default recommendation for most households. You get the full 97% handle saving, a brush that is easy to buy anywhere, and a company that states its bristle spec on the record — which, in a category built on vague “eco” language, is worth more than it should be.

The bristles are nylon-6, and there is no point pretending otherwise: this brush solves the handle problem and leaves the bristle problem exactly where it found it. What it does well is remove every excuse not to switch. A five-pack covers more than a year at the dental association’s three-to-four-month replacement interval, the handle is unvarnished bamboo, and the brand is explicit that the product is free from BPA, PFAS and PTFE.

Pros

• Publishes its bristle material openly (nylon-6)
• Stated free from BPA, PFAS and PTFE
• Five-pack covers over a year of replacements
• Widely stocked, so resupply is never a problem

Cons

• Bristles are petroleum nylon, not plant-derived
• Does nothing about bristle shedding
• Handle needs drying between uses to avoid swelling
• More expensive per brush than budget multipacks

The whole handle saving, from a brand that tells you what the bristle is.

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Best Value

Greenzla Bamboo Toothbrushes (4-Pack)

A year of bamboo brushing for the price of a couple of single brushes, with a bamboo travel case and charcoal floss included.

4-Pack BPA-Free Nylon Bristles Charcoal-Infused, Soft Travel Case Included

Verdict: The pick if cost is what has been stopping the switch. Four brushes is almost exactly a year at the recommended replacement interval, and the handle saving is identical to the more expensive brushes — bamboo is bamboo. The bristles are BPA-free nylon, infused with charcoal.

One caution worth naming, because the 2025 release study found it directly: the cheapest brush in that trial shed the most microplastic, at 39 particles a day, and bristle material and shape were both factors in how much fragmented. We are not claiming that result transfers to this specific product, which was not in the study. We are saying that budget bristle is a real variable, and that the honest reason to buy a value multipack is cost, not performance.

Pros

• Lowest cost per brush of the three picks
• Four brushes covers a full year of replacements
• Bamboo travel case and charcoal floss included
• Soft bristles suit sensitive gums

Cons

• Bristles are nylon, same as a plastic brush
• Budget bristle is the variable the 2025 study flagged
• Charcoal infusion is cosmetic, not a cleaning benefit
• Handles vary slightly in finish between units

A year of bamboo brushing, at the price point that actually gets switched.

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• Free delivery for Prime members
• Travel case and floss included

For the wider field, including kids’ brushes and the charcoal options we do not recommend, see our plastic-free toothbrush guide. The rest of the counter is covered in the plastic-free bathroom guide, and the two products most likely to be sitting beside the brush are handled in our non-toxic toothpaste and plastic-free dental floss picks.

Can You Actually Compost a Bamboo Toothbrush?

The handle, yes. The brush, no — and this is where the category’s marketing is at its loosest. The bristles are a polymer and they are held in place by metal staples, so both have to come out before anything goes near a compost heap. The study authors did exactly this as part of building their inventory, pulling the bristles and staples from a bamboo brush with tweezers, and recorded how long it took: almost 30 minutes per brush. They concluded it was unrealistic to expect consumers to do it.

The realistic version is simpler and still worth doing. Snap or cut the head off the handle, put the head in the bin, and compost, chip or burn the bare bamboo. You keep most of the benefit and you do not spend half an hour with tweezers. A brush whose instructions quietly assume you will is a brush making a claim it has not earned — the same pattern as a “BPA-free” label on a plastic that swapped BPA for BPS.

What the Handle Switch Does Not Fix

Three things, and they are worth knowing before you count the problem solved.

The bristles. They are the only part of the brush that enters your mouth, the only part that sheds while you use it, and the part that bamboo leaves untouched on all but a handful of brands. Everything the 2025 Microchemical Journal paper measured came off the bristle, not the handle.

The replacement interval. The three-month cycle is what turns a 20-gram object into a 6.3-kilogram lifetime pile. A filament that genuinely lasts six months halves that, which is why bristle longevity is a larger lever than handle material and why the Cureus finding above matters more than it looks.

Everything else in the bathroom. A toothbrush is about 20 grams. The razor, the shampoo bottle, the shower curtain liner and the toothpaste tube are all heavier, and the particles you actually ingest in the largest numbers come from food and water rather than from brushing — see what has been measured in the human body for the scale.

So Which Should You Buy?

The quiet answer in the data is the one nobody sells: a manual brush with a replaceable head was the best performer overall, and bamboo was the best performer on plastic specifically. If plastic is the thing you are trying to remove from your house, bamboo is the right buy. Just buy it knowing that the bristles came with it.