... 3 The effect is very good 4, Tooth Whitener with Light Technology Easy to use teeth whitening gel specification:1, Teeth ... at home and is extremely easy to use4, The advanced light combined with the specially formulated gel, rapidly removes surface stains ... deep to remove embedded stains5, Mini blue light. 6, Accelerate whitening with this 90 nm light. 7, Battery life 6 hours. 8, Replaceable ...