Our 35% solution has been shown to provide the whitest teeth in the shortest amount of time. Please note this is a very powerful solution and can cause irritation if your gums are not in good health. Burning or stinging gums after application are often a sign of gingivitis or periodontal disease. Indications for use: For cosmetic treatment of naturally discolored teeth. This gel will not whiten crowns, dentures or veneers. It will not harm dental work. Our new formula whitening gel enters the porous enamel of the teeth and gently oxygenates the discoloration of the teeth without changing the structure of the teeth whatsoever.