Has anyone tried this teeth whitening system? I have somewhat white teeth as it is but I had a friend come to town last week and his teeth were WHITE...all thanks to Go smile..so off I go to the shops to buy it! Im on day 3...using the whitening dose twice a day and also the Am toothpaste they recommend, and the Pm one. It is wonderful! I love the way it tastes, my teeth are already getting even whiter and I swear my breathe is fresh so much more! Great stuff. Have you tried it?