This 22% Watts Power White Optimized Formula offers the same whitening power as the 35% or stronger minus the sting. Simply wear this 10 minutes longer than the stronger formulas to obtain the same results. Better for your teeth easier on your gums... Whiten your teeth in half the time at home with this optimized formula by Watts Power White. This gel is formulated to store in the refrigerator for touch ups for up to 2 1/2 years... Obtain 5-10 Shades Whiter in 20 Days. Only 30 minutes or less per application. We also include the aftercare gels used after bleaching. Quality 22% carbamide peroxide gel used worldwide.. This formula is Made in the USA. Its going in your mouth be safe and buy smart... Make sure its Made in the USA... Formulated with 100-percent pure formula -- no fillers or additives used. Optimized pH formula for higher whitening performance. Kosher USP glycerin (no animal by-products). Includes: Four thermo-forming trays Two 10-cc syringe (80 treatments) filled with 22-percent bleaching gel Two tray containers Two free aftercare gels plus 2 travel cases. Complete Instructions.