glo science teeth whitening pen [SEP] i am not a fan of this glo science teeth whitening pen the clicking mechanism is super annoying a twisting mechanism would have been so much easier the thick bulky silicone tipped applicator is annoying as well and a lot of the gel gets left in its little bumps and grooves it does not apply smoothly or evenly at all i have been using it twice per day but have not seen any results the taste of the gel is absolutely horrible there is like a weird floral perfume quality to the taste do not like