what is the most effective teeth whitening system on the market?

i really want white teeth, i don't want to go to the doctor to get it done though i want something cheap but that works, do crest white strips work? please give me any advice that you have with teeth whiting systems. thank you
--------------------
Try Arm & Hammer Whitening Booster. You just add some to your toothpaste. It works well! Get it online. I don't know if it's in stores yet.
Source