... Easy control and good effect. 2.Convenient for use. 3.Good Price. Teeth whitening light is ... simple, practical, safe, you just need continuously use 3 to 5 times, each time 20 minutes, ... the pigment in teeth.Item specificsteeth whitening home use lightavailable for logo print 1, Fixed Voltage: ... LED colour:blue4, Wavelength:460~465nm5, Continuous use:48 hoursAdvantages1.it's high in quality and ...