Designed to remove stains and whiten your teeth in the comfort of your own home. ? Stains caused by smoking, drinks & food ? Enamel Safe & Peroxide Free ? Safe & Easy to use, no mess Instructions for use For full results use entire kit. Peel the upper and lower strip from plastic backing liner and apply strips to upper and lower teeth. Wear for a minimum of 30 and maximum of 120 minutes It is best if you do not brush your teeth immediately before applying strips.