A.G.
Crest White strips work well, although the best kind is the kind from the dentist. but some over the counter ones work good enough. and just so you know most people get tooth sensitivity while whitening but don't worry once you are done with the treatment it will go away. Also for best results don't eat or drink foods that stain while for the days or weeks that you are whitening it can cause the teeth to stain even more and make the treatment not as effective.