answer:@Afos22: Some people have teeth more prone to staining, and all the brushing in the world won’t help if you love coffee, tea or ****. You’re a super helpful person. @sfgal: I have tried them, I didn’t think they worked as well as the regular ones. Took a few days 3–4 for me to really notice anything. I suspect if your teeth are darker than mine were to begin with you would notice sooner. I was really just using it as a sort of booster. I believe the package said just to rinse, and that’s what I did – it has been a while since I did this. I always did it while I was watching tv, and planned it for halfway thru and episode so I would be distracted with something while the taste was in my mouth. That way I could forget the taste during whitening and after I rinsed just by being distracted. I do remember never bothering to use them again though. They gave me the impression they didn’t work as well. They were fine, but not as good as I would have liked.