easy for sensitive teeth [SEP] glo science teeth whitening pen aplications safe and efective no sensitivity easy to use dentist invented whitening treatment travel friendlyare my teeth whiter yes it is not so white that anyone will see me and be like wow your teeth are so white but it is whiter and i notice it which i prefer i have very sensitive teeth and almost no enamel the pen is a click pen and you have click quite a lot to get it started i thought mine was faulty at first and the clicker even got stuck half way down but i smacked it and it popped back and i kept clicking the silicone tip has little bristles and it does a good job of coming off on your teeth i was worried the gel would not grip onto my teeth and would slide but it did not it does have a cinnamon taste and it does dry in seconds it was easy enough to smile for seconds and it was on there truly i forgot about it after that do not eat or drink for min if you can are my teeth whiter i could not tell after use but after two i also could not tell but i took a before and after photo which i will save you from because my lips look awful right now and my teeth are definitely visibly whiter i am happy with this it is easy to put on does not make my teeth sensitive works for whitening dries quickly and you do not even have to spit it out