Whitening toothpastes will work for some people and be of no benefit to others. Everyone wants to look better and what easier way to do it by just changing your toothpaste?!
I saw this in the chemist yesterday and thought I might give it a try. Having an open mind is the key to constant advancement. It was pretty cheap for $8. This by no means is anything close to a proper scientific experiment but is just a personal subjective opinion.