easy for sensitive teeth [SEP] GLO Science Teeth Whitening Pen 35 Aplications, Safe and Efective, No Sensitivity, Easy to Use Dentist Invented Whitening Treatment, Travel-Friendly<br /><br />Are my teeth whiter? Yes. It's 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 wouldn't grip onto my teeth and would slide, but it didn't. It does have a cinnamon taste, and it does dry in 30 seconds, it was easy enough to smile for 30 seconds and it was on there. Truly I forgot about it after that (don't eat or drink for 30 min if you can). Are my teeth whiter? I couldn't tell after 1 use, but after two, I also couldn't tell... BUT I took a before and after photo (which I'll save you from because my lips look awful right now) and my teeth are definitely visibly whiter! I'm happy with this, it's easy to put on, doesn't make my teeth sensitive, works for whitening, dries quickly, and you don't even have to spit it out.