Crest instructions strip white. Remove the strips and discard. Close esc Popup. You are not supposed to be selling expired items! Please enter your email address. This is Crest's first bleaching product, introduced in Mrs I requested these for a Christmas Present. Open 1 packet of the strips and remove from the plastic backing. So with that said I would recommend. Dry your teeth before opening and applying the strips, but DON'T brush. Need some clarity on which side of the strip goes against my teeth.