Key Information: ‣ Active Ingredients: Potassium Fluoride (1470ppm F-) ‣ Uses: Whitening pen that reinforces whitening in interdental spaces. Indicated above all for people with orthodontia or small punctual stains. ‣ Direction:Turn the cylinder of the Pen until the gel reaches the applicator. Put a thin layer of gel on the teeth. Let the gel act for 15 minutes.