Castor Oil Bristles: The 'Plant-Based' Toothbrush Bristle That's Still Nylon

What you bought is plastic. The brand selling it to you was caught lying about it by the UK Advertising Standards Authority in 2022. The brand dissolved as a UK company in August 2025. Their websites are still selling the same product to you in 2026. There are measurable plastic particles in human placentas, lung tissue, blood, and arterial plaque — and patients with plastic in their carotid plaque suffer heart attacks and strokes at 4.5 times the rate of patients without. No regulator on Earth has set a safe daily intake for the plastic you swallow. This pillar walks through what your bristle actually is, where the particles go, what specific brands say versus what the chemistry shows, and what you can do about it. The good news: the plastic-free toothbrush problem was already solved in 3500× BCE. We covered the broader oral-care toxicity question in our oral-care chemicals guide; this is the bristle-specific reckoning.

Castor oil toothbrush bristles are polyamide-11 (PA11), a synthetic nylon polymer made by polymerising castor-oil-derived 11-aminoundecanoic acid in an industrial reactor. The seed gets cracked open at 500°C in the presence of methanol vapour. The molecule gets rearranged through five chemical steps. The polymer gets spun into bristle-stiffness fibres at industrial scale. The plant supplied the carbon. The chemistry built the plastic. Whatever the marketing said, what's in your mouth twice a day is nylon — bio-based nylon, but nylon.

Three polyamides circulate under variations of the "castor oil bristle" umbrella, and which one a brand uses changes how much petroleum is in your bristle. PA11polyamide-11; nylon-11; fully bio-based via 11-aminoundecanoic acid from castor is fully plant-fed. PA610polyamide-6,10; nylon-6,10; partially bio-based, sebacic acid from castor + petrochemical hexamethylenediamine is only 67% plant-fed — the other 33% is petroleum, the same monomer used in conventional petroleum nylon. PA1010polyamide-10,10; nylon-10,10; fully bio-based via two castor-derived monomers is fully plant-fed but produced by different chemistry. All three are nylon. None of them biodegrades. Your toothbrush almost certainly does not name which one it uses.

A manual toothbrush releases between 39 and several thousand microplastic particles per day during normal brushing, with annual exposure modelled at roughly 49,000 particles per person from toothbrush use alone. Three peer-reviewed studies between 2023 and 2025 produced these numbers — the first time the dental-wear literature and the microplastic-pollution literature have actually bridged. Until 2023 nobody had counted what comes off a brushing toothbrush. Now they have.

Researchers used Raman imaging to estimate microplastic release from manual toothbrushes during simulated brushing. The kind of methodical experimental setup the abstract describes in two sentences and the discussion section acknowledges took months to calibrate. They placed commercial toothbrushes on automated brushing rigs, ran them through synthetic-saliva cycles, captured the rinse water, and scanned every fragment with Raman spectroscopy. The release amount per brushing cycle was, in the authors' own words, thousands daily microplastic particles released by a manual toothbrush during simulated brushing. Fang 2023

A separate research group did something the dental industry never thought to. They took the toothbrushes themselves apart, dissolved the bristle bundles in chemical reagents, and asked how many polymer particles were physically embedded in a brand-new brush before any human had touched it. The result: 30–120 microplastic particles per brush, on a brand-new toothbrush head. The polymer-by-percentage breakdown across oral-care products: polyethylene 52%, polyamide 30%, polyethylene terephthalate 15%. The annual exposure projection — modelled, not measured — was 48,910 projected microplastic particles per individual per year from toothbrush use alone. India's projected daily emission from mouthwash alone: 74× billion particles. Protyusha et al. 2024

Forty-eight thousand nine hundred and ten. Those particles aren't going somewhere abstract. They're going down your throat with the toothpaste foam, into your gut, into your wastewater stream, into the air that you breathe back in while you brush. The dental literature still measures bristle wear in length and stiffness; the environmental literature measures it in particle count; nobody has translated the two into a microgram value. The cumulative dose of nylon entering your body via brushing has gone unmeasured for as long as nylon bristles have existed. A reasonable next question is: where do the particles end up?

Microplastic particles cross the gut barrier into the bloodstream and accumulate in human placenta, lung tissue, and arterial plaque — and patients with plastic particles in their carotid plaque suffer heart attacks and strokes at 4.5 times the rate of patients without. Three landmark studies between 2021 and 2024 changed what "microplastic exposure" means as a category. Until 2021 it was something that happened in fish. Now it is something that happens in placentas. The category did not change because microplastics did. The category changed because someone finally measured.

The placenta paper came first. Researchers in Rome examined six healthy human placentas using Raman microspectroscopya laser technique that identifies polymer fragments by their molecular fingerprint. They found 12 microplastic fragments identified across 4 of 6 placentas, sized 5-10 micrometres (Ragusa et al. 2021) fragments between 5 and 10 micrometres in size, distributed across maternal, foetal, and amniotic tissue compartments. The polymers were polypropylene and other pigment-bearing fragments consistent with packaging, paint, and cosmetics. The first detection of plastic on the foetal side of the placenta was published in a journal called Environment International in early 2021. It got the response a story like that deserved, which is to say almost none. Ragusa et al. 2021

The blood paper followed in 2022. Twenty-two healthy Dutch volunteers gave whole-blood samples; researchers used pyrolysis-GC-MS to detect and quantify polymer particles by mass. The mean total plastic particle concentration in human blood was 1.6 µg/mL mean total plastic particle concentration in human blood (Leslie et al. 2022). Polyethylene terephthalate, polyethylene, polymers of styrene, and PMMA were the most-detected polymers. The detection floor was around 700 nanometres. Leslie et al. 2022 Then the lung paper. Surgical lung-tissue samples from 13 patients showed microplastics in 11 of 13 patients had detectable microplastics in lung tissue, concentrated in the lower lobes (Jenner et al. 2022) — 39 fragments total, concentrated in the lower lobes, exactly where you'd expect inhaled fragments to settle. Jenner et al. 2022 Brushing aerosolises particles. You're not just swallowing the bristle — you're breathing it.

Then the New England Journal of Medicine in March 2024. Three hundred and four Italian patients undergoing carotid endarterectomy — surgical removal of arterial plaque — were enrolled and followed for an average of 33.7 months. Polyethylene was detected in 58.4% of carotid plaques showed detectable polyethylene microplastics — Marfella 2024 of plaques (150 of 257 followed-up patients). PVC in 12.1%. Patients with microplastics in their plaque had a hazard ratio of 4.53× higher risk of MI, stroke, or all-cause death than patients without microplastics in plaque for the primary composite of non-fatal myocardial infarction, non-fatal stroke, or death from any cause (95% CI 2.00-10.27, P<0.001). Marfella et al. 2024

Marfella's detection panel was polyethylene and PVC only — not polyamide-11 specifically. The study cannot prove that the nylon shedding off your toothbrush is in your arteries. What it does prove is that synthetic polymer fragments inside human arterial tissue track with hard cardiovascular outcomes. The biological principle generalises to other persistent polymers including PA11 — the amide bond is not less stable in vivo than the C–C bonds in polyethylene — but the specific particle Marfella measured in arterial macrophages was polyethylene. The honest framing is that nobody has yet measured your toothbrush's polymer specifically. So far nobody has looked. The detection panel decision is also an editorial decision, and the bristle-grade polymer hasn't been on the panel yet.

Boar bristle and horsehair are keratin — a protein your stomach has enzymes to digest. Polyamide-11 is a synthetic plastic with an amide bond no enzyme on Earth can cleave at body temperature. That is the entire biological difference between a fibre that breaks down to amino acids in your gut and a fibre that accumulates wherever the bloodstream takes it.

Your digestive system is a four-billion-year-old machine for breaking down protein. Pepsin in the stomach. Trypsin and chymotrypsin in the small intestine. Keratinases in the gut microbiome. The same enzymatic toolkit that handles a chicken breast also handles a worn boar-bristle fragment that lands on your tongue. The fibre breaks down to amino acids over hours, gets absorbed, gets used to build something else. Your body did not have to learn keratin. It already knew it.

Polyamide-11 is different. The amide bond in nylon is structurally similar to the peptide bond in protein but rotated and stabilised in a way that no biological enzyme on Earth can cleave at biological temperatures. You have no enzyme for nylon. A worn bristle fragment that gets into your gut goes through your gut. The fragments small enough to cross the gut barrier go into your bloodstream. The fragments small enough to cross the alveolar barrier go into your lungs. The fragments small enough to lodge in arterial macrophages go into your atherosclerotic plaque. The reason keratin fibres do not show up in Marfella's plaques is that your body has enzymes for keratin. The reason polymer fragments do show up is that nobody has the enzyme for plastic. That asymmetry is the entire toothbrush question, in a sentence.

Yes. Plant-based plastic is still plastic. The European Commission ruled this in writing in 2021, and the UK Advertising Standards Authority adjudicated the same against the toothbrush brand Bambooi in October 2022. Bio-based does not mean biodegradable. Plant-fed does not mean plastic-free. Both regulators have the receipts.

The SUPDSingle-Use Plastics Directive 2019/904, Article 3(1), defines "plastic" as "a material consisting of a polymer... to which additives or other substances may have been added, and which can function as a main structural component of final products, with the exception of natural polymers that have not been chemically modified." The carve-out is narrow on purpose. Cellulose, chitin, and natural rubber latex — polymers polymerised by a living organism and physically extracted — qualify. A polymer synthesised in a chemical reactor from a plant-derived monomer does not. The European Commission's 2021 guidance on the directive made the position non-negotiable:

The polymerisation of 11-aminoundecanoic acid into PA11 is the textbook definition of chemical modification — bonds form, water leaves, a new molecule emerges, the chemical structure is changed. Brussels said no, in writing, with a paragraph number. The bioplastics industry lobbied for the opposite interpretation and lost. EU Plastic 2019 UK Plastic — ASA upheld 2022 2022. Anyone selling "plant-based" bristles in 2026 as plastic-free in the UK or EU is doing so against the explicit position of both regulators.

On 26 October 2022, the UK Advertising Standards Authority ruled that Bambooi Sustainable Enterprises Ltd misled consumers by advertising their "Bio Max" toothbrush as "100% Plant-Based Materials," "#NoPlastic," and "Eco Friendly" when the bristles were a bioplastic. Three years later the UK company dissolved at Companies House. The websites kept selling the same product.

The brand's legal response is the part that landed the killing blow. Bambooi told the ASA, in writing, that they had "never intended to imply that the product was plastic-free" and that "the product contained a bioplastic material." Read that twice. The brand admitted, under regulator pressure, that they meant for consumers to think "plant-based" meant "plastic-free" — and were untroubled when consumers did. They were unable to provide a copy of any plant-based certification without the manufacturer's approval, did not provide a list of materials used, and offered no evidence to demonstrate biodegradability. ASA Ruling G22-1154356 (Bambooi Sustainable Enterprises Ltd)

The ASA's reasoning was direct. Consumers seeing "#NoPlastic" would understand it to mean "none of the 'plant-based' materials used in the product were plastics of any kind, including plastics derived from renewable biomass" — that is, including bioplastics. The product contained a bioplastic. The two facts were in straightforward contradiction. The ASA upheld every environmental claim as misleading and ordered the ads pulled in their existing form.

Then the editorial twist nobody could have written. Bambooi Sustainable Enterprises Ltd, company number 12360801, was dissolved at Companies House on 14 August 2025. The UK legal entity behind the toothbrush no longer exists. And yet. The bambooi.us, bambooi.co.uk, and bambooi.com domains remain live in 2026, still listing the "Bio Max" toothbrush, still using language adjacent to the marketing the ASA ruled against three years ago. The regulator caught one brand. The company dissolved. The websites kept selling. Whoever now operates the brand inventory did not have to register a new UK company. The legal accountability dissolved on a Companies House record; the e-commerce did not.

None of the well-marketed "plant-based" toothbrush brands sells a bristle that is actually plastic-free. Truthbrush, Battle Green, Hydrophil, Humble Co, Brush With Bamboo, and Yaweco all use a synthetic polyamide bristle — PA11, PA610, PA1010, or even nylon-6 — depending on the brand. The variation between brands is not whether they sell plastic; it's how honestly they admit it. The brand most willing to name the polymer is the brand whose marketing budget is the smallest. That is not coincidence; it is marketing economics.

Truthbrush is the most interesting case. The brand's UK FAQ states the bristles are "100% castor oil" — but the same product, listed across multiple US retailers (The Savage Homestead, Hippy Monkey, Fields Farm), is described as "62% castor bean oil and 38% nylon." Same brand. Same product. Two different stories on different webpages. Either the FAQ is misleading or the retail listings are wrong; both are unlikely to be honest at once.

Humble Co, the most-bought "plant-based" toothbrush in mainstream retail (Whole Foods, Holland & Barrett, dozens of UK pharmacies), historically disclosed bristles as "Nylon-6 and 65% plant-based material (castor bean)." That is to say: the most-shopped "plant-based" brush on Earth is one-third petrochemical nylon. Their current product copy avoids the disclosure altogether — a marketing decision, not a chemistry change.

Battle Green publishes its own contradiction in plain sight. Their disposal instructions read: "the medium-firm bristles are 100% bio-based, derived from renewable castor oil and made in Germany... When the brush reaches the end of its life... remove the bristles with pliers and compost the handle, or snap off the brush head and send it back for recycling through a UK-based waste management business." The bristles cannot go in the compost. The brand's own customer-facing words concede this — the disposal step is a manual extraction of the part the marketing language called biodegradable. The handle, which is bamboo, is the part that biodegrades. The bristle, which is PA11, is the part that goes in the bin or the post.

Hydrophil is the most honest of the European brands. They use the term "bio-nylon" — the word nylon appears, on the label, voluntarily. That is more transparency than every other brand on this list except Brush With Bamboo and Yaweco, both of which name the specific polymer grade. The brand most willing to use the word "nylon" out loud is the brand whose marketing budget is the smallest. That is the rule.

Polyamide-11 (PA11) is a synthetic plastic made by polymerising 11-aminoundecanoic acid from castor oil, sold under Arkema's Rilsan® trade name since 1949 — and it is not biodegradable in any practical timeframe. PA11 holds no certification under EN 13432 industrial composting, ASTM D6400, ASTM D6691 marine biodegradation, or any home-compost standard. The polymer's industrial selling point is the opposite of biodegradability.

Even the company that makes the polymer does not pretend it biodegrades. Arkema's industrial-customer page for PA11 calls it "the polymeric reference material for offshore flexible risers and flowlines," with a 30-year subsea service life and a formal lifetime-prediction model published as American Petroleum Institute Technical Report 17 TR 2 in 2003. They sell the same polymer to BP for North Sea pipelines as they sell to your toothbrush brand. The 30-year claim has an API technical report behind it. The biodegradable claim has a hashtag. The toothbrush brand selling PA11 to you is the only party in the supply chain running the biodegradability story.

On 24 February 1938, DuPont commercialised the world's first nylon toothbrush bristle, sold by Weco Products of Chicago as "Dr West's Miracle Tuft Toothbrush." The advertising called the natural boar bristle it replaced "unsanitary," and the new nylon "miraculous." The same DuPont product line — under the name Tynex — is still in commercial production in 2026. The plastic toothbrush bristle has had eighty-eight years to escape the bathroom and has not.

The 1938 marketing playbook is the playbook your bamboo toothbrush is using. Modern, clean, miraculous, scientific — the Du Pont copy. Plant-based, eco, natural, biodegradable — the 2026 copy. Both versions sold the consumer a synthetic nylon bristle as the future. Both versions worked. The 1938 version sold so well that by the 1950s nylon bristles were 80% of the US toothbrush market. The 2026 version is selling well enough that no major UK brand has voluntarily changed its marketing language since the ASA's 2022 ruling.

Almost ninety years later we know the boar bristle was right. The Marfella study found nylon-family microplastic particles correlated with hard cardiovascular outcomes in human arterial tissue. Synthetic polymer fragments accumulate where the bloodstream takes them and stay there because no biological enzyme cleaves the synthetic amide bond. The 1938 advertising claim that boar bristle was "unsanitary" was the original lie in this category. Every "plant-based bristle" sold in 2026 is a marketing reissue of the 1938 nylon, with the same chemistry and a fresh wrapper. The audience changed. The polymer didn't.

The same ricinoleic acid molecule that becomes the bristle on a "100% castor oil" toothbrush is the active ingredient in castor oil laxative — FDA-approved Category 1, in continuous medicinal use for two thousand years. Same molecule. Two pipelines. One opens your bowels. The other accumulates in your arterial plaque.

The 18-carbon hydroxy fatty acid in castor oil — ricinoleic acid — has two industrial destinies. Heat-cracked at 500°C with methanol vapour, it becomes 11-aminoundecanoic acid, the monomer for polyamide-11. Untreated and ingested as oil, it binds the EP3 prostaglandin receptor on intestinal smooth muscle and triggers motility — the mechanism researchers finally proved in 2012. Tunaru et al. 2012 Same molecule, two doors. The toothbrush brand selling you "100% castor oil bristles" is, technically, accurate about the carbon. They are wishful about the door it walked through.

For at least 5,000 years before nylon was invented in 1938, people cleaned their teeth with the miswak chewing stick (Salvadora persica), boar bristles set in bone or bamboo handles, and horsehair on wooden handles. None of these contained plastic. The plastic toothbrush is 88 years old. The alternatives are 5,000.

The miswakthe chewing-stick form of toothbrush, made from the root, twig, or stem of Salvadora persica; in continuous use for at least 5,000 years appears in Babylonian texts dating to roughly 3500 BCE. Egyptian tomb paintings show similar implements. Five thousand years of continuous use across continents, predating literacy and the wheel. Researchers in 2008 showed miswak has direct antimicrobial activity against periodontal pathogens — Porphyromonas gingivalisa Gram-negative bacterium implicated in periodontal disease, Aggregatibacter actinomycetemcomitans, Haemophilus influenzae — releasing volatile compounds that kill the bacteria, not just abrade them off. Sofrata et al. 2008

The bristled-handle toothbrush as a recognisable object first appears in a Chinese encyclopedia from 1498, late Ming dynasty under the Hongzhi Emperor — bone or bamboo handle, hog-neck bristles, recognisable to a 21st-century user. Three centuries later, in 1770, an English entrepreneur named William Addis is said to have invented the modern English toothbrush in Newgate Prison, drilling holes in a small bone fragment and threading boar bristle through them. The story is the company's own founding legend — not independently verified — but Wisdom Toothbrushes still operates in Haverhill, UK, two and a half centuries later. Then in 1938 DuPont came along and called all of it unsanitary.

Around 88.5% of the world's castor oil supply comes from India, with one state — Gujarat — producing roughly two-thirds of the global total on smallholder farms. The seed contains 1-5% ricin by weight, one of the most acutely toxic substances ever measured. The four chemical companies who buy from Gujarat formed a "Sustainable Castor Initiative" in 2016 — distributing 10,000 free safety kits to farmers along the way. Multi-stakeholder sustainability programmes do not get launched in supply chains where everything was fine. FAOSTAT 2023

Ricin partitions to the seedmeal cake during oil extraction, not the oil itself — so the finished product is not a ricin exposure pathway for consumers. Workers handling the cake, the dust, and raw seeds are a different matter. Castor-bean asthma is a documented occupational allergen syndrome going back to 1980s cohort studies of dockworkers handling raw cargo. Thorpe et al. 1987 The Pragati Sustainable Castor Initiativea multi-stakeholder programme founded by Arkema, BASF, Jayant Agro-Organics, and Solidaridad in May 2016 to address sustainability gaps in Gujarat's castor supply chain has by year nine trained 10,000 farmers, certified 140,000 cumulative tonnes of castor seed, and put 12,000 hectares under the SuCCESS Sustainable Castor Code. The free safety kits are the partner-published acknowledgement that worker PPE was historically inadequate. The fact that PA11 had been in commercial production for 67 years before anyone organised a sustainability initiative is not a footnote — it is the story.

Because the UK regulator with the power to fine — the Competition and Markets Authority — only got that power in April 2025, and chose to use it on gym memberships and concert ticket pricing first. The Advertising Standards Authority can rule against misleading bristle ads — they did, against Bambooi in 2022 — but cannot impose fines. They rely on voluntary compliance. The voluntary compliance has been: nothing.

On 6 April 2025, Statutory Instrument 2025/272 brought the Digital Markets, Competition and Consumers Act 2024UK statute giving the CMA direct civil enforcement powers over consumer protection law, with fines up to 10% of global turnover into force. The CMA gained direct civil enforcement powers under consumer protection law for the first time. The new fines are up to 10% of global turnover for the corporate body, plus £300,000 personal liability for accessory individuals. For a small bristle brand the personal liability is the deterrent that matters; for a large one the turnover percentage is. The tools to make "plant-based bristle" greenwashing very expensive existed in UK law for the first time on the same day the spring tax year began.

Eight months later, in November 2025, the CMA opened its first batch of direct enforcement investigations. Eight investigations across secondary ticketing, driving schools, gym chains, and homeware retailers, plus 100 advisory letters to other businesses. The investigation focus: drip pricing, mandatory fees, time-limited promotional sales, default opt-ins, pressure selling. Zero of the eight investigations were greenwashing cases. The new fine power exists. The first place it has been pointed is at gyms quoting £19.99/month and charging £29.99 after the joining fee. The CMA cares more about your gym membership than the polymer in your toothbrush. That is not necessarily wrong — drip pricing is a real harm too — but it is the calculation bristle brands are making when they keep their marketing language exactly the same.

Meanwhile, the EU's planned Green Claims Directive — the proposal that would have required substantiation of every "plant-based," "biodegradable," "sustainable," and "eco-friendly" claim across the EU — went into suspension in June 2025. The Commission announced conditional withdrawal; Italy withdrew support; the trilogue was cancelled. Brussels tried, Brussels gave up. The directive that would have forced bristle brands to back up their bio-claims is, as of mid-2026, paused indefinitely. The brands who priced in continued enforcement got a longer runway than they expected.

Three checks separate genuine plastic-free bristles from polyamide-11 in green clothing: name the polymer, ask for a compost certification number, and read the disposal instructions. If the brand cannot pass all three, the bristle is plastic. Reading a bristle product page in thirty seconds is a skill. The brands betting on the regulatory gap are betting you do not have it.

The phrase "100% bio-based, plastic-free, biodegradable" on a single bristle product is the marketing tell. 0× of those three words is supported by EU regulatory definitions if the bristle is PA11, PA610, PA1010, or PA612. The brand is choosing words that consumers hear as one thing and lawyers hear as another. The ASA's 2022 ruling said the consumer interpretation is the legally relevant one — and the brand lost.

Three bristle types contain no polymer, no nylon, and no plastic at any stage of their existence: boar bristle (keratin protein), horsehair (keratin protein), and miswak (the Salvadora persica chewing stick, plant fibre). All three predate the synthetic toothbrush by centuries. None shed microplastic during use. Switch

Boar bristle is keratin — the same structural protein as human hair, fingernails, horse hooves, and cow horn. The bristle has natural tapered tips that grip plaque without scratching enamel. The fibre is sourced as a byproduct of the existing pork industry — the same trade-off vegan readers have already weighed for animal-derived ingredients elsewhere. Horsehair is finer, softer, sourced from grooming and trimming rather than slaughter, and works for sensitive gums. Miswak is plant fibre with no manufactured bristle at all — releases volatile antimicrobial compounds during chewing, in continuous use across Africa, the Arabian Peninsula, and South Asia for 5,000 years.

We use the boar-bristle path on our bamboo toothbrush and horsehair toothbrush, specifically because the bristle is the part of the toothbrush that ends up in your mouth and your wastewater for an entire lifetime of brushing. The handle being bamboo is helpful for compost; the bristle being protein is what changes the microplastic story. The vegan question is real and worth weighing — that is the conversation we would have at the kitchen table. The chemistry question, by contrast, is settled.

Three actions cover most of the readers who finish this article. Switch If your bathroom contains a "plant-based" toothbrush whose bristles you cannot identify, switch the next time you replace it. Boar bristle and horsehair are the two protein-fibre options; miswak is the no-bristle option. The brands selling you PA11 dressed in green language are not breaking the law — but they are selling you nylon and calling it plant. That difference is the difference between an informed swap and a thirty-pound mistake.

The reader is the trigger mechanism. The ASAAdvertising Standards Authority only acts on complaints. The complaint form is at asa.org.uk/make-a-complaint and takes about ten minutes. If you see a brand using "100% plant-based" or "#NoPlastic" on a product whose bristles are PA11, PA610, or PA1010, file the complaint. Bambooi 2022 happened because somebody filed one. Three years and 47 weeks later, the company is dissolved and the precedent is on the public record. The CMACompetition and Markets Authority's complaint mechanism is at gov.uk — they can fine 10% of global turnover. They have not yet, on bristles. They might, if enough people make the case.

And if your instinct after reading this is to share the article with the friend who bought a "100% castor oil" toothbrush at a wellness pop-up — that is the third thing. The asymmetry between brand marketing budget and reader-correction speed is currently in the brand's favour. That asymmetry only inverts when readers act faster than the marketing department's next campaign. The information is now public. The decision is yours.

Start with the word "polyamide." If the brand will not say it, you already have the answer.