Professional whitening, without the aggressive chemicals and the often associated tooth sensitivity. Smyle uses the latest whitening innovation PAP (phtalimidoperoxycaproic acid). In combination with the other active ingredients in the Smyle gel (sodium bicarbonate, sorbitol, sodium coco sulfate, xylitol, bromelain and papain), this whitens your teeth up to 7 shades in 10 days in 15 minutes a day.