If your retainer cracks or breaks due to normal usage within the first 60 days (120 days for premium retainers), we will replace it for free using your existing impression or Filed Smile.  Keep in mind, your retainer's lifespan can be shortened considerably if you grind or clench your teeth while wearing at night. If your retainer has cracked and you would like a replacement, please consider getting a grind guard retainer. This product will of course still retain your teeth, but is a bit thicker and will take more clenching and grinding. Contact us and we'll have you send the cracked retainer back with your impression for a replacement* *Our warranty does not cover products that have been chewed up by pets or products that have been lost