Peel open sachet to reveal two whitening strips. 2. Place the smaller strip on your bottom teeth, and the larger strip on your top teeth. Tuck away any overhanging strip behind the teeth to ensure even whitening. 3. After 30 minutes, peel the strips off and rinse away any residual gel. Then, brush with your regular toothpaste for 2 minutes. After your first treatment, based on your results, you can decide whether you want to continue using the strips for fourteen consecutive days or save the remaining strips for future treatments as and when you feel your teeth need a whitening boost.