Posted by a reviewer on Amazon

No tooth sensitivity using this product so far.

Posted by a reviewer on Amazon

Isn't sensitive to your teeth in the least.

Posted by a reviewer on Amazon

It doesn't create any uncomfortable sensitivity (which others have).

Posted by a reviewer on Amazon

The first time, the gel was so thin that it barely stuck to my teeth and i almost always forgot that i even needed to rinse it off.

Posted by a reviewer on Amazon

However, with the latest purchase, the gel was so sticky and thick that i couldn't even talk with it on my teeth.

Posted by a reviewer on Amazon

In fact, his front teeth were so dark that in pictures it looked like he was missing three teeth.

Posted by a reviewer on Amazon

I thought i would try the pen, just to feel that i was doing something about whitening my teeth, though i was sure, given the price and ease of use, that it would probably not work very well.

Posted by a reviewer on Amazon

I purchased this item after reading several great reviews.