Directions for use: To obtain the best whitening result with this 0% peroxide formula (2 to 5 shades), simply apply the gel to the white teeth 2 times / day for 1 week: - Turn the base of the pen in the direction needles of a Wirst watch until a drop of gel is obtained on the tip. - Open your mouth and keep your lips away from your teeth. - Pass the pen over your teeth for about 20 seconds: the gel will then be automatically activated. - You will notice that the gel produces a little bit of foam, which means that it acts actively on the disappearance of organic stains. - Do not rinse: the effect of the gel lasts for a few minutes after application. Caution: keep out of reach of children - Avoid contact with eyes. - In case of sensitivity during / after use, stop the treatment and consult. - Store the pen in a cool place.