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Zendura FLX retainer
Zendura FLX retainers with an elastomeric inner core for flexibility and a hard outer shell for grip. Handles rotation, extrusion and protects against grinding.
Engineered for performance
The science behind Zendura FLX
Zendura FLX is a tri-layer material for clear aligners and retainers — a soft elastomeric core for comfort, wrapped in tough outer shells for grip and durability. Published testing from Zendura's manufacturer, alongside an independent peer-reviewed force-retention study, shows what that combination delivers — sources below.
500%stronger tear resistance than Essix ACE
82%elastic recovery — springs back to shape
56.8%of its force retained after 24 hours
Crack resistance
It resists tearing and cracking
Tear strength measures how well the material withstands tearing forces. Zendura FLX's tri-layer build gives it far higher tear strength than mono-layer plastics — 64% stronger than CA Pro and 500% stronger than Essix ACE — so it stands up to repeated insertion and removal.
Higher is better ↑ · tear strength (N/mm) Comfort
Gentle, consistent force
Most aligner plastics hit the teeth with a high initial force that fades fast. Zendura FLX starts gentler — the lowest initial force of the materials tested — and holds onto it, retaining 56.8% after 24 hours. Lower starting force means less stress on the teeth and more comfort for patients.
Lower is better ↓ · initial force on the teeth (g) Shape memory
It springs back to its shape
Elastic recovery is how well the material returns to its original shape after being flexed. At 82%, Zendura FLX recovers far better than other retainer plastics — so it keeps its fit and keeps working across the wear period.
Higher is better ↑ · elastic recovery after 24h (%) How it's built
Three layers, two jobs
Zendura FLX is a tri-layer material: a soft elastomeric core sandwiched between two tough outer shells. The core flexes for comfort and shape memory; the shells grip the teeth and resist wear — giving you flexibility and durability in one appliance.
Cross-section through the materialHard outer shellgrip & durability
Elastomeric coreflexibility & comfort
Hard inner shellfit & strength
Source: Zendura FLX manufacturer brochure. Force-retention study: Elshazly et al. (2024), Orthod Craniofac Res 27(S2). CA Pro & Duran, MaxFlex, Essix, Taglus and GT Flex are trademarks of their respective owners.
The range
More orthodontics
Explore the rest of the range — tap any appliance for its details.
01 
Essix retainer
Next-generation thermoformed Essix retainers — enhanced flexibility, exceptional clarity and a soft occlusion for patient comfort.
View details 02
Zendura A retainer
Zendura A — high-performing rigid resin with superior crack resistance and stain clarity. Also suitable as a thin hard bruxism appliance.
View details 04 
Fixed retainer
A bonded fixed retainer wire bent to the tooth contours, supplied with a custom seating jig for precise chairside placement.
View details 05 
Retainer with pontic
A clear retainer with a pontic tooth to hide gaps after extraction — virtually invisible, with a natural look and pre-extraction options for same-day fitting.
View detailsEasy to work with
Two ways to send us a case
Scan or impression — whichever your practice prefers.
Post an impression
Alginate or silicone in a rigid tray with a bite registration — or ask about free collection.
Arrange collectionFAQ
Questions about the zendura flx retainer
What is a Zendura FLX retainer?
Zendura FLX is a dual-layer retainer with a flexible elastomeric inner core and a hard outer shell. The combination grips the teeth well, handles rotation and extrusion, and protects against grinding.
When would I choose Zendura FLX over Zendura A?
Choose FLX when you need flexibility to seat over rotations or extrusions while keeping a hard, hard-wearing outer surface; Zendura A is fully rigid.
What do you need to make one?
A single-arch scan or impression of the arch to be retained.
Send us your first case
Open an account, request a price list, or just send a scan — we'll take it from there.