Review (3/5): Hard to apply accurately
After 3 applications I do not see the effects yet, although I feel the sensitivity, so it has the peroxid working.
My main complain is the applicator tip. The goo comes out in the middle of it, and it has some rubber bumpy thingies around. The surface of the tip is relatively large and you do not see the edges or the goo why applying it (as it faces your teeth). So I would say it is much harder to apply this right next to your gum line accurately, than some other whitening pens having a pointy bristle top.
The idea is good, but currently I would prefer a smaller tip (even as a 6ft tall male).
3 stars for now, let me use it for a while and update the review if my opinion changes.