— composition
Bio-derived plant polymer. Zero harmful plastics.
Tested below detection limits for BPA and phthalates.
You wear your retainer for 8 hours every night. For years. No other retainer brand in the UK has published independent third-party testing data for microplastic particle release. We have. Results published in full.
Bio-derived plant polymer. Zero harmful plastics.
Tested below detection limits for BPA and phthalates.
"bio. retainers are the only retainers in the UK independently tested for microplastic particle release and confirmed free from harmful microplastics. This is not a marketing claim. It is a published scientific result."
| Test | Method | Standard | Result |
|---|---|---|---|
| Microplastic particle release | Simulated wear conditions (saliva simulant, 37°C, 14 days) | ISO 10993-12 extraction protocol | Below detection limit |
| BPA, BPS, BPF leachate | LC-MS/MS analysis of eluate | EU Regulation (EC) No 10/2011 | Not detected |
| Phthalates | GC-MS extraction analysis | REACH Annex XVII | Not detected |
| Heavy metals | ICP-MS (oral simulant) | ISO 10993-13 | Below limits |
| Biocompatibility | Cytotoxicity assay | ISO 10993-5 | Biocompatible |
| Polymer composition | FTIR spectroscopy | In-house disclosure standard | Published at bio.uk/standard |
Full reports by lot number at bio.uk/standard. Re-tested on every new production batch.
Most dental device brands never disclose their materials. We built the opposite model: every substance disclosed, every claim tested, every result published.
Order online. Your impression kit arrives next day. Takes 10 minutes at home with step-by-step instructions and a video walkthrough. Post back in the included pre-paid packaging. Custom retainers crafted and delivered within 5 working days.
Prefer a digital scan? We'll connect you to your nearest bio. partner practice. A 15-minute appointment. No extra cost. More precise impression, same turnaround time. Recommended for complex cases.
Your retainer is custom-made to your teeth. The subscription keeps your set fresh year on year — teeth shift, materials age. An annual replacement is the standard of care.
Includes impression kit + custom retainers. Delivered in 5 working days.
Annual replacement set. Fresh retainers, every year, delivered automatically.
Order your retainers— Every bio.aligner treatment includes a free retainer set
Every bio. clear braces treatment ends with a free bio.retainer set on completion — the only retainer in the UK with published independent material testing results. The clean standard, from first tray to retention.
Choose your pathway. We'll be in touch within one business day to confirm and dispatch your impression kit.
We'll be in touch within one business day to confirm your order and dispatch your impression kit.