https://brighterimagelab.com/sp_faq/already-set-moldable-mouthpieces-can-purchase-just-hi-intensity-teeth-whitening-gel/

Yes, we sell Hi-Intensity™, Competitive Strength Carbamide Peroxide Teeth Whitening Gel separately in various quantities (please click the order now button below for more details). This is the same Hi-Intensity™ Teeth Whitening Gel that is sold in our complete Lab Direct™ Teeth Whitening Systems and professional dental offices. It can be used with any dental tray in the same way as your previous teeth whitening gel.