My mom told me that you can dip your wet tooth brush into a bottle of peroxide, then brush your teeth with it. Over time, your teeth will become much whiter. Just don't swallow the peroxide. I have found that it works after about a week of daily use. The bottle of peroxide only costs .99 at most drug and food stores.
By McCollonough from TN
Although the price of professional teeth whitening has come down, it can still be outside of your budget. This is a page about frugal teeth whitening.