Toothbrushes and plastic: bamboo handles, nylon bristles and what's actually plastic-free

Here is the plastic-free bathroom in one object. You swapped the plastic toothbrush for a bamboo one, and the bit that goes in your mouth is still plastic. That’s not a scandal; it’s a trade-off almost nobody explains. This guide goes through what toothbrushes are made of, what each “eco” option actually changes, and what dentists’ evidence says about the parts you can’t compromise on.

One rule first, the same one as in our bathroom guide: keep brushing twice a day. No plastic saving is worth gum disease. (Toothpaste has its own guide.)

What a toothbrush is made of

A standard manual toothbrush is a polypropylene handle with nylon bristles, materials a 2024 Italian life cycle study describes as non-biodegradable and non-recyclable. In a typical factory model, the handle is injection-moulded and the bristle tufts are stapled into the head with small metal staples. That makes a toothbrush a mixed-material object, plastic plus metal, designed to be thrown away every few months.

How many get thrown away? We found no measured count. The big round numbers quoted online don’t survive a trace: the worldwide figure in that Italian study is referenced to a dental trade-magazine news item, where it’s a quote from a bamboo-toothbrush company’s co-founder, and its US figure is given as “market data” with no source at all. So we’ve left the numbers out. What is certain is the habit: the ADA says to replace a brush every three to four months, so each of us gets through several a year, for something we hold for a few minutes a day.

Bristles: nylon, “plant-based”, charcoal, silicone and boar hair

Nylon, the default since 1938

Toothbrushes used hog bristles for centuries. The first nylon-bristled toothbrush appeared in 1938, and nylon took over because its filaments are solid rather than hollow, don’t absorb water, and are more uniform and durable than animal hair.

“Nylon” covers several polymers. A DuPont patent for toothbrush filaments lists nylon 6, 6,6, 6,10, 10,10, 11 and 6,12, and names nylon 6,12 “most preferred”. That’s an industry document, not a survey of what’s on shelves. Some brushes use polyester instead, such as the polyester-filament brushes in a 2026 wear study. Makers rarely say which one you’re getting: of the brushes in our table below, none named its type of nylon. The one that named a bristle polymer at all, Berninox, uses recycled PBT, a polyester.

“Plant-based” and castor-oil bristles: still a plastic

Bristles sold as “plant-based”, “bio-based” or “castor oil” are a nylon made from plants instead of oil. Castor oil, for example, is the raw material for PA11, a polyamide, which is the chemical name for nylon. Same family of plastic, different starting point.

That can cut the fossil carbon in the bristles. It doesn’t make them break down. Brush with Bamboo, whose bristles it says are made from 100% castor bean oil, says on its own disposal page that they are “biobased but not biodegradable”. Credit to them for saying so. “Plant-based” on a toothbrush can also mean something else entirely: one maker’s “plant-based” brush has a handle made with 40% wheat straw blended with polypropylene, and nylon bristles. For more on what “bio-based” does and doesn’t mean, see our guide to compostable and bioplastic claims.

Charcoal-infused bristles

Black “charcoal” bristles are nylon with charcoal mixed in; Humble describes its version as nylon, charcoal-infused. Charcoal is often sold as antibacterial. A German lab study that contaminated five bristle types, including charcoal-with-nylon, found none had a particular antimicrobial effect, charcoal included. It’s a colour, not a feature, and it’s still a plastic bristle.

Boar and other animal bristles

Animal hair, usually from pigs, is the only plastic-free bristle we know of on a conventional toothbrush. The evidence on it is thin and mostly old. That German lab study is the most recent we found: it put pig bristles alongside nylon and found no significant difference in bacterial growth or survival, with the lowest counts on either nylon or pig bristle, and concluded natural bristles don’t pose a microbiological risk. That’s one lab test, not a clinical trial. We found no modern trial comparing how well boar and nylon bristles clean teeth, or how hard they are on gums; the comparisons we found date from the 1950s to the 1970s.

Silicone bristles

A niche option. The Italian study found silicone bristles had lower impact than nylon in all 18 categories it measured, by 14% on average. A 2026 review of ten small studies found silicone brushes cleaned comparably to nylon, but the evidence is thin. Silicone is a synthetic polymer too; see our silicone explainer.

What dental bodies say

Neither the American Dental Association nor the NHS names a bristle material: neither recommends nylon as such. What they ask for is softness. The ADA recommends soft bristles because they minimise the risk of gum abrasion, and for its Seal it wants bristles free of sharp or jagged ends that won’t fall out with normal use. The NHS says medium or soft, round-end bristles suit most people.

Boar bristle is hard to square with that. Animal hair is less uniform in diameter and stiffness than nylon, whose tips can be end-rounded to reduce gum injury, and the one natural-bristle maker we found didn’t state firmness or tip shape. Even the bio-based plastic bristles on one beech brush are sold as medium-hard. In practice, the soft brushes we found on sale have nylon bristles. That’s why we treat nylon bristles as an exception rather than a failure (see the LPP standard below).

Handles: bamboo, wood, metal and recycled plastic

Bamboo

A bamboo handle isn’t moulded; in a UK model it was shaped with wood-working machinery and heat-treated, with the bristles stapled in. Makers rarely say whether the handle is waxed, oiled or lacquered; none of the bamboo brushes in our table did.

On footprint, bamboo does better, but by less than the marketing implies. A UK life cycle assessment over five years of brushing found bamboo and replaceable-head plastic brushes had the lowest environmental impact of the four types tested. A later study by the same group, modelling school brushing programmes, found switching to bamboo cut the climate impact by only 15% and 6% in its two scenarios (it modelled children’s brushes), while land use rose 68% in the school-brushing scenario. The authors call bamboo “a positive step but not the ideal answer.”

Does it clean as well? A 2026 meta-analysis of five trials found no clear difference in plaque removal between biodegradable or natural brushes and plastic ones, but rated that evidence very low certainty. A small Saudi trial of 30 people found plaque fell with every brush type, and conventional brushes carried almost four times the microbes of bamboo ones.

We found no study measuring mould on bamboo handles, a worry many readers raise. Brush with Bamboo’s own advice is to use an open-air holder: “enclosed toothbrush cups that collect water are not ideal.” The ADA gives the same advice for any brush: store it upright and let it air dry.

Wood

Beech handles work the same way as bamboo. Some makers say what they’ve done to the wood, from “simply waxed” to “untreated beechwood”. We found no life cycle study of beech toothbrushes specifically.

Aluminium or steel handles with replaceable heads

Here you keep the handle and throw away only the head. Colgate launched Keep in February 2021 with a 100% aluminium handle and a snap-on head it said uses 80% less plastic than a similar Colgate brush; we couldn’t confirm it is still sold in November 2026, as Colgate’s site blocked our checks and some retailers list it as discontinued. Berninox makes a 316L steel handle with a recycled polypropylene head, recycled PBT bristles, rubbery TPE gum filaments and metal staples. In both, the head that goes in your mouth contains plastic, not just the bristles. Some makers sell bamboo heads instead: Humble’s replaceable-head brush has a bamboo handle and bamboo heads with nylon bristles; the maker lists only bamboo, nylon and stainless steel clamps, though it doesn’t say whether the bamboo is finished. A plastic replaceable-head brush scored among the lowest-impact options in the UK life cycle study, and the Italian study also found swapping only the head cut emissions.

Recycled plastic

Preserve makes handles from 100% recycled #5 plastic, at least half post-consumer, with new nylon bristles and a mail-in recycling scheme. One earlier modelling study found recycled-polypropylene handles were the most sustainable design on paper, though the same authors note real-world plastic recycling rarely works that well. It’s less new plastic, not less plastic.

Electric or manual

Powered brushes clean better. The Cochrane review, the most-cited summary, pooled 51 trials and found powered brushes reduced plaque by 11% in the short term and 21% after three months, and gum inflammation by 6% and 11%, on moderate-quality evidence. That review is from 2014, but newer work agrees: a 2026 meta-analysis of 21 trials in adults with gingivitis found powered brushes gave substantially greater reductions in gum bleeding and plaque, with oscillating-rotating and sonic brushes doing best. Cochrane’s authors added that the clinical importance of the difference was unclear, and both the ADA and the NHS say either type works.

The environmental cost is real. In the UK life cycle study, the electric brush had the highest impact in 15 of 16 categories, and its climate impact was 11 times bamboo’s. You also end up with a battery and electronics, which belong in small electrical recycling, not the bin. The heads are plastic: Philips says Sonicare heads are now 70% bio-based plastic, counted on a “mass balance” basis, which generally means bio-based feedstock is allocated on paper across production rather than present in each head.

Our view: if your dentist has told you that you need an electric brush, for gum disease, braces or limited hand movement, use one and keep it for years. If not, a manual brush used well is fine.

Do toothbrushes shed microplastics?

Yes, a little, every time. Bristles wear down and the bits go somewhere. Researchers using Raman imaging estimated brushing releases thousands of microplastic particles daily. A Chinese lab simulation put it at at least 2.3 million particles a year per person from toothbrushes, and its authors concluded the products didn’t pose a direct health risk. These are lab estimates using different methods, so don’t compare them directly, and nobody has shown what swallowing them does. Bamboo handles don’t change this; the bristles are the source. For what’s known about plastic in the body, see microplastics inside you.

Where the plastic is

What makers say on their own pages (two rows come from retailer listings, marked, and Colgate Keep from its 2021 launch release), as of 12 November 2026. “Not disclosed” means the page didn’t say. We haven’t tested these and none is recommended; this is a map of materials, not a shopping list. For what LPP would require, see our standards.

Brush	Handle	Bristles	Coating, glue or staples	Packaging	Replaceable head
Humble Brush Bamboo	100% bamboo	Nylon (type not disclosed)	Stainless steel clamps; finish not disclosed	Cardboard box, paper bag	No
Humble Brush Bamboo, charcoal	100% bamboo	Charcoal-infused nylon	Stainless steel clamps; finish not disclosed	Cardboard box, paper bag	No
Humble “Plant-based Toothbrush”	40% wheat straw blended with polypropylene	Nylon	Stainless steel clamps	Cardboard box, paper bag	No
Georganics Beechwood	Beechwood (FSC)	Nylon	Not disclosed	Cardboard box	No
Brush with Bamboo	Moso bamboo	“100% castor bean oil”, bio-based but not biodegradable	Aluminium staples; coating not disclosed	Paper box, no tape or glue	No
Kost Kamm beech (retailer listing)	Beech, waxed	“Biobased plastic”, medium-hard	Wax; fixing not disclosed	Organic cotton bag	No
Redecker wooden (retailer listing)	Untreated beech	“Sterilized natural bristles” (animal not named)	Not disclosed	Not disclosed	No
Colgate Keep (February 2021 launch details; current availability not confirmed)	100% aluminium	Not disclosed	Not disclosed	Cardboard, 60% recycled	Yes; head material not disclosed (“80% less plastic”)
Berninox 316 Ocean	316L stainless steel	Recycled PBT (no nylon) plus TPE gum filaments	Metal staples	Not disclosed	Yes; recycled polypropylene
Preserve	100% recycled #5 plastic (≥50% post-consumer)	New nylon	Not disclosed	Recycled paperboard	No (mail-in recycling)
Colgate Extra Clean	Not disclosed	Not disclosed	Not disclosed	Not disclosed	No
Philips Sonicare (powered)	Electric handle, materials not disclosed	Not disclosed	Not disclosed	Recyclable (material not stated)	Yes; heads “70% bio-based plastic” (mass balance)

Two patterns stand out. Every named bristle except Redecker’s natural one is plastic, whatever the handle. And the biggest brands disclose the least: the mainstream plastic brush and the powered one tell you almost nothing about what they’re made of.

How often to replace it, and how to get rid of it

The ADA says to replace a toothbrush about every three to four months, or sooner if the bristles are matted or frayed. The evidence for a fixed date is softer than the advice. In a small Italian study, students who kept one brush for three months kept plaque as low as those who got a new one each month. A 2026 lab study found worn small-headed brushes cleaned worse after six months’ simulated use, while standard heads held up. Sensible rule: replace it when the bristles splay, and don’t stretch one past a few months.

Disposal depends on the brush:

• Bamboo or wooden handle: pull the bristles out first. Brush with Bamboo’s instructions are to grip one tuft at a time with pliers, which also pulls out the metal staples. The bristles, plant-based or not, go in the bin or a take-back scheme; the bare handle can be composted.
• Replaceable head: only the head goes. Check whether the maker runs a take-back scheme.
• Recycled-plastic brush: Preserve runs a mail-in recycling scheme.
• Electric: heads in the bin or a take-back scheme; the handle goes to small electrical recycling at the end of its life.

What the LPP standard allows

Our standard bans plastic touching your mouth, with one named exception. Since 12 November 2026, nylon toothbrush bristles are allowed, but only in brushes rated plastic-minimal, only when the handle and the head are not plastic, and always named on the listing. A plastic replaceable head is plastic in your mouth, so it doesn’t qualify. Replaceable heads, where only the bristled head is thrown away, rank higher.

Put plainly: a bamboo or wooden brush with nylon bristles can qualify as plastic-minimal, and so can a metal or bamboo handle with bamboo replaceable heads. A brush with a plastic handle, recycled or “plant-based”, can’t, and nor can a metal handle with a plastic head. Nothing with nylon bristles is ever called plastic-free. The reason for the exception is the one above: dental bodies recommend a soft-bristled brush, and the soft brushes on sale are nylon. We won’t trade your gums for a smaller pile of plastic.

The bottom line

• The handle is the easy part. Bamboo, wood and metal all cut plastic, though bamboo’s climate benefit is modest.
• The bristles are almost always plastic, including the “plant-based” ones. That’s fine for now; the soft, round tip matters more.
• Replaceable heads and keeping one handle for years beat buying a new brush of any material.
• Electric brushes clean better and cost the planet more. Use one if you need it, and keep it.
• Brush well, twice a day, and replace it when it’s worn. That beats any material swap.