xuanfei cold light LED teeth whitening system.it can be powered by most smart devices. Common devices include apple and android smartphones and tablets.come with 4 whiting gel pen and 1 whiting device.
step 1 clean your teeth with tooth paster,must be clean very good.
step 2 used paper towel wiper off all the waters on the teeth surface.for best result must wiper all the waters.
step 3 plug in whiting device with your home eletronic device like ihone,ipad.when you see blue light,put whiting device in your mouth.must bite up and down teeth tiely for 15-20mins.
step 4 rinse off good,aviod to eat and drink at least 30 mins after done whiting.
ps:blue gel only for sensitive teeth.if your teeth is sesitive type,apply blue gel at button of your teeth close to your gum.