Janina ultra white maxiwhite whitening strips 7 day system has been developed to provide visibly whiter teeth without the use of hydrogen peroxidethe hydrogen peroxidefree formula is based on an innovative and enamel friendly whitening ingredient that removes stains and safely whitens natural teethconvenient and easy to use the mint flavoured strips can be used twice a day for 7 consecutive days for fast results or once a day for results in 14 days if preferred each application takes only 3