The extra strong Power Whitening Strips will make your teeth up to 8 shades whiter in just 7 days. In addition, Smilepen Power Whitening Strips contain Hyaluron & Hydroxyapatite, which strengthens the teeth and cares for the gums, making them suitable for sensitive teeth as well. Say goodbye to irritated gums after the treatment and get radiant white teeth in just a few days. You will see initial results after just one treatment.Package includes: 14 x 2 Whitening Strips.Instructions: Clean and dry your teeth before application. Simply peel off the protective film from the larger strip and place the adhesive side of the strips on