Tooth whitening pen is a tooth whitening product that do not need any tray.You enjoy using it while on the move.Containing high quality, viscous whitening gel you can acheive up to 11 shades whiter.It safely and effectively remove all external stains on your teeth caused by things like coffee, tea and red wine.<br><br> <br><br>Tooth whitening pen gel is one of the strongest formulations in the market.It deep into the tooth to lighten the internal pigments that stained your teeth.Designed to provide whitening maintenance after an initial whitening treatment, the Whitening Pen is the perfect way to maintain your whiter smile - or alternatively use alone, twice a day for up to 20 days or until desired shade has been reached, for most users this takes only 1 week.<br><br>