What are bio. retainers made of?

A bio-derived, plant-based polymer — independently tested for microplastic and BPA-derivative release, with results published by lot, BPA, BPS, BPF and phthalates. No other UK retainer brand has published equivalent testing.

Why is bio. the only retainer brand to publish microplastic testing?

Every retainer in the UK market is made from standard thermoplastic that has not been independently tested for microplastic shedding. bio. is the first to test ours and the first to publish the data.

How does the impression kit work?

Order online and your kit arrives next day with step-by-step instructions and a video walkthrough. It takes about 10 minutes at home. Post it back in the included pre-paid packaging. Custom retainers are delivered within 5 working days.

Why do I need to replace my retainer each year?

Teeth shift and materials age. An annual replacement is the standard of care, and the subscription keeps a fresh, tested set on your teeth without re-ordering.

Is this teledentistry?

No. Every case is managed by a registered UK clinician. Clean materials and proper supervision are part of the same product.

bio. shop

Choose your treatment.

Name: bio.retainers
Brand: bio.
Availability: InStock

Retainers today, with the rest of the range to follow. Every order is backed by published material testing.

✓ ISO 17025 tested materials ✓ Plant-derived polymer ✓ Results published by lot ✓ Delivered in 5 working days ✓ No practice visit required

bio.retainers

The UK's only retainer with published material testing.

Single set

bio.retainers

From £100

One-time purchase

Upper, lower, or both arches
Bio-derived plant polymer
ISO 17025 tested, results published
Impression kit available (+£30)
Delivered in 5 working days

Order your retainers →

Annual subscription

bio.retainers

From £140/yr

Annual · cancel anytime

New custom retainers every 12 months
Automatic renewal, no re-ordering
Same material, same published testing
Cancel by email anytime
Save £35 vs. repeat first-set pricing

Subscribe — £140/yr →

bio.aligners include a free first retainer set on completion. Book a free aligner consultation →

How checkout works

Ready to order?

On the next step you'll choose your arches — upper, lower, or both — pick one-off or annual, and add an impression kit if you need one. Then we make your retainer to fit and deliver in 5 working days.

/ 01

Choose & pay

Select your options at our secure Stripe checkout. Card details are never stored by bio.

/ 02

Take your impression

Your kit arrives next day, or upload an existing scan. Around 10 minutes at home.

/ 03

We make & deliver

Custom-made to your teeth and delivered within 5 working days.

Build your order → See full product details →

Secure checkout powered by Stripe. Your impression kit, if selected, ships next day.