I just started using the whitestrips recently and already I have seen pretty amazing results. Literally, in just 3 days, as it says on the box, my teeth were significantly whiter than before. When using the strips, your teeth can become really sensitive, though. But that will eventually subside. Overall, I am super, super happy with this product and would reccomend it to anyone and everyone who needs a 'lil brightening up of the smile. And if you get the newer, more advanced ones, you shouldn't have to worry about sitting in front of a tv for half an hour or whatnot. As long as you don't have to do much talking, you're set! I'm happy :)