Zendura FLX

Other plastic aligners offer some strength, but less elasticity. That's why Str8™ uses Zendura FLX™, the highest-calibre biocompatible plastic available in the world. The Str8™ clear custom plastic aligners have an elastomeric middle layer that provides stronger tooth-moving forces over time than possible with standard thermoplastics. Completely clear, resistant to cracks and stains, they're also more comfortable to wear at first compared to other leading brands, which you will appreciate. Zendura FLX™, the highest-calibre biocompatible plastic available in the world.