The bio. Journal

What's in your mouth, and why it matters.

Clear, evidence-based writing on microplastics, dental materials and the science of what your retainer is actually made of. Researched, referenced, and free of scare tactics.

Research · 8 min read

Retainer microplastics: the nightly exposure nobody measured

30,000+ hours of contact, one piece of petroleum plastic, no published data — and the three things that actually reduce the exposure.

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Research · 8 min read

Microplastics and BPA in fillings: what research shows

White fillings are plastic-based. What they release, for how long, and what to do about it — read honestly, no scare tactics.

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Research · 9 min read

Microplastics in the human body: what's been found

Blood, placenta, lungs — the landmark detections, what science honestly doesn't know yet, and where dental devices fit.

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Research · 7 min read

Nightguards, dentures, mouthguards: the overlooked plastics

Ground nightly, worn for decades, bitten through every match — the oral plastics nobody measures, and the questions to ask.

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Guides · 7 min read

BPA-free retainers UK: what to look for

What "BPA-free" actually means, why the substitutes matter as much as BPA, and how to verify a maker's claim before you buy.

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Guides · 9 min read

Plastic-free dentistry: an honest guide

From toothbrushes to retainers and aligners — what "plastic-free" genuinely means, what sheds during wear, and the questions worth asking of any brand.

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Materials · 6 min read

What are dental retainers made of?

Almost every retainer in the UK is made from the same family of thermoplastics — and almost no manufacturer publishes what they shed during wear. Here's what the materials actually are.

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Research · 8 min read

Microplastics and clear aligners: what the research says

A growing body of peer-reviewed work has measured what orthodontic plastics release under simulated wear. We summarise the findings — and what's still unknown.

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Guides · 7 min read

Invisalign alternatives in the UK: an honest guide

From at-home brands to clinic-led treatment, the UK aligner market has changed fast. A clear-eyed look at the options, the trade-offs, and what to watch for.

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Care · 5 min read

How often should you replace your retainer?

Retainers warp, wear and harbour bacteria long before most people replace them. What the evidence says about timing — and why the material matters.

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