I've used strips and they worked ok but if you don't stop eating problem things you'll be fighting it forever. I thought the gel filled foam mouldings style worked better than strips. Ime dentist gets the best results, you don't sit around drooling and foaming at the mouth 5 nights a week, and you get a nice slut hanging her tits in your face.
I think it's uric acid that does the whitening. Hope you don't get no gout, brah.