What is the best teeth whitener that I can buy at a drug store.?

I want to whiten my teeth but can't afford really expensive stuff. What's the best that I can buy at a drug store.
--------------------
it's called "5 minute speed whitening gel" it's at walgreens/cvs and all those basic common stores you can get one tube of it that will last you like 3 months and it's about 3 dollars. OR for 5 dollars you can get the tube, a little mouthguard type thing to put the gel in and put it in your mouth, plus some mouthwash that helps make it even whiter. I'd recommend just buying the tube. you'll see pretty dramatic results after the second day. ALL you have to do is put the gel on your teeth, leave it on for 5 minutes, then rinse it off and voi la! gorgeous teeth!! :) I use it all the time and get soo many compliments :) plus the more you use it the longer you can make the time that you keep it on your teeth. i do about 10 minutes now and they are like SHOCKINGLY white afterwards lol hope it works for you :) Moxie
Source