I actually received my GoSmile Teeth Whitening System as a gift, and was definitely open to the possibility of this being an awesome product. There certainly seems to be lots of hype of this product; I'm sad to say that's all there is to the GoSmile Teeth Whitening kit. First, this set is very expensive, although you get several days worth of applications it's only a value if it actually works. I saw absolutely no whitening change in my teeth after using this (my husband had the same results) and although I like the application process of the GoSmile System (the ampulletes actually made this quite easy and no mess) but I think ultimately this delivery system is what makes this product a failure. The ingredients used in this GoSmile set really are no better than other less expensive whiteners, and actually some of the other brands I have had slight success with. However, I think because you put this on your teeth with no shield/boundaries my saliva seems to dilute it and renders it ineffective. I wanted to like this but honestly can say Go Smile was not only a waste of money but also a waste of my time. Since using this I have had my teeth professionally whitened, and was amazed by the results. Professional whitening is much more expensive and actually hurt my gums (and made my teeth sensitive for a week) but it worked - GoSmile didn't hurt my gums but it tasted nasty and ultimately did little to nothing to my teeth.