Thanks to the Very Good Smile® pen, you get brilliant whiteness in complete safety! It allows you to reach the back teeth, or to select the teeth to whiten. — Formula developed in a French laboratory, contains less than 1% peroxide, complies with French standards — 2ml of gel — apply once a day for 5 to 10 days The Very Good Smile® pen slips into your handbag and can be taken anywhere. Whiten your teeth at work, in the car, on the bus, before an appointment. It's the must-have beauty accessory!