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TWENTY-ONE TREATMENTS INSTEAD OF FOURTEEN: this is the pack for people who have already tried the purple strips and want to finish the course without reordering halfway through. Same formula, fifty per cent more treatments. TWO ACTIONS: the purple V34 pigment cancels yellow tones on sight from the very first strip. PAP, the whitening agent in the formula, works over time instead, lightening the shade of the enamel. No hydrogen peroxide. GENTLE ON SENSITIVE TEETH: PAP is what makes that possible. It lightens without hydrogen peroxide, which is the most common cause of discomfort during and after a whitening treatment. 42 STRIPS, TWO PER TREATMENT: one for the upper arch, one for the lower, thirty minutes each time. No lamp, no gel to measure out, no device to charge. THE LOWEST COST PER TREATMENT: same product as the 28 pack, better price per treatment. esmile customer service reachable in English.