i just brush right after drinking the coffee or rinse my teeth out if im not at home. my teeth are stained, but no more than they were when i was about 12 years old. all the bleach related whitening stuff like those white strips and pretty much any whitening solution that actually works are bad for your teeth. and to me pain in your teeth is the worst kind of pain there is after in the nutsack so im not taking the risk. if i had badly stained teeth i would but they are just like normal stained you know.