Where is quality control?
I had high expectations for this product - I've been watching their TV presentations for months before placing the order.  Before anything else, they are so poorly made that you can't even open the tubes!  Forget bending the tube as directed!  I had to use scissors to open 4 out of 7 whitening tubes, which damaged the stick swab and made it very awkward  to hold.  And yes, it burned when touched the gums the first couple of times, and actually left a white stain on the edge of the lower gum, which I had trouble removing. The stain remover would work better if you could actually rub the stains with someting less flimsy than the "Q-tip" swab provided...  The extra pen works pretty well.  In all, very cheaply made and not worth the price!  Concentrating on a few front teeth, I was able to get rid of some stain and whiten my teeth a shade.  This product probably would work best soon after a professional dental cleaning, on teeth with very little stain and fairly white to begin with - no miracles here...
Rating: 3 stars