Turn the pen base clockwise (3 - 4 steps) to moisten the brush with the gel.
Disperse the gel on the teeth and rub the surface thoroughly for 2 minutes.
At this stage, regularly moisten the brush with more gel, turning the base clockwise. It normally takes 10 - 12 steps to dispense an adequate amount of whitening gel for each use.
Spit out the remaining gel without rinsing. Do not eat or drink for at least 30 minutes.
At the end of use, clean the silicone brush with a tissue and put the cap back on the pen.