Guides11 min
Castor Oil Bristles vs Nylon: Are They Actually Different?
Castor oil toothbrush bristles are a type of nylon — bio-based, but nylon. How they compare to petroleum nylon and to genuinely plastic-free bristles.
Read article →7 Aug 2026
Guides10 min
How Long Do Castor Oil Toothbrush Bristles Last?
Castor oil bristles last about as long as any nylon — roughly three months, or when they splay. The wear science, and what worn bristles shed.
Read article →7 Aug 2026
Guides12 min
Is There a Plastic-Free Electric Toothbrush? An Honest Answer
No electric toothbrush is genuinely plastic-free — the bristles are always a polymer, even plant-based ones. What the sustainable brands do and don't fix.
Read article →7 Aug 2026
Guides9 min
Boar vs Horsehair Toothbrush: The Difference Is Bristle Diameter
Two natural-bristle brushes, same handle and pressure-fitted head. The bristles differ in one measurement — thickness — and that decides which suits your gums.
Read article →6 Aug 2026
Guides11 min
What Are Forever Chemicals? The Nickname, and What It Gets Right
Forever chemicals is a nickname, not a chemical name. Who coined it, what forever really means for the planet and for your blood, and where you meet them.
Read article →7 Aug 2026
Guides
Eso World Delivery and Shipping: How Your Order Gets to You
Eso World is a shop, not a courier. This page covers our own order delivery: dispatch times, UK and international rates, tracking, and lost-parcel steps.
7 Aug 202612 min
Guides11 min
Red Lens Blue Light Glasses: What the Tint Actually Does
Red, amber, clear: the tint is the mechanism, not the styling. What the transmittance numbers show, what the sleep trials support, and where the case thins.
Read article →7 Aug 2026
Guides11 min
Sodium Laureth Sulfate: What It Does, and the Dioxane Question
Sodium laureth sulfate is not SLS, and it is not an endocrine disruptor. The real story is 1,4-dioxane — a byproduct of the step that makes SLES milder.
Read article →7 Aug 2026
Guides11 min
Are Boar Bristle Toothbrushes Safe? The Bacteria Question, Honestly
Natural hair holds water and nylon does not. The one controlled test of bacteria on pig bristle found no difference. Both facts belong in the same answer.
Read article →7 Aug 2026
Guides11 min
Are Horsehair Toothbrushes Safe? The Case, and the Caveats
Horsehair is the finest natural bristle at 50-80 microns. That helps sensitive gums. It also raises real questions about moisture, sourcing and allergy.
Read article →7 Aug 2026
Guides9 min
How Long Do Boar Bristle Toothbrushes Last? Two to Three Months
Two to three months — but that interval is a hygiene convention, not a measured cleaning cliff. What wear, handle darkening and composting actually look like.
Read article →7 Aug 2026
Guides
Bamboo vs Boar Bristle Toothbrush: One Is a Handle, One Is a Bristle
Bamboo is the handle, boar is the bristle — they are not alternatives. The real choice is what the bristles are made of and what holds them in.
7 Aug 202610 min
Guides11 min
What Are Xenoestrogens? Estrogen Disruptors and the Evidence
Xenoestrogens are the oestrogen-mimicking subset of endocrine disruptors. What makes a molecule fit the receptor, where they occur, and where the evidence stops.
Read article →7 Aug 2026
Guides12 min
Endocrine Disruptor Examples: The Common Ones, Sorted by Evidence
A sorted list of the endocrine disruptors you actually meet: where each turns up, and how strong the evidence is — strong, moderate and contested kept apart.
Read article →7 Aug 2026
Guides11 min
Where Is Glyphosate Found? Food, Water, and What Urine Testing Shows
Glyphosate turns up in oats, pulses, bread and rivers — and in most people's urine. Where it comes from, and which avoidance steps actually do anything.
Read article →7 Aug 2026
Guides11 min
Non Toxic Ear Plugs: What's Actually in Your Ear Canal
Foam, PVC, silicone — what actually sits in your ear canal for eight hours, which materials are inert, and what 'non-toxic' can honestly mean here.
Read article →7 Aug 2026
Guides11 min
Is UK Tap Water Safe to Drink? What British Regulation Covers — and What It Doesn't
A UK-only answer: what the DWI actually tests, what carries no legal limit here (PFAS, microplastics), and where lead pipes and hardness still bite.
Read article →7 Aug 2026
Guides
BPA Replaced by BPS, BPF and BPAF: Which One Went Where
BPA replaced by BPS, BPF and BPAF — three near-identical molecules that took three different jobs. What each one is, where it turns up, how to spot it.
7 Aug 202612 min
Stay current
New research, when we find it.
One email when we find something worth reading. No schedule, no filler.
Every product page shows you exactly what's in it.
Full material breakdowns. What we left out, and why.
Browse products