Hydrogen Peroxide, after brushing your teeth, pour some of this on your toothbrush and brush your teeth with it. It works as a whitener! It might foam a bit in your mouth but that just means it's killing bacteria! P.S. do not swallow!. :)
Remembering this when i paint my new house -- To get rid of paint fumes... add a tablespoon of vanilla extract to a gallon of paint, mix well. It does not effect paint color! And makes the whole room smell like vanilla when you're done! Need this now!!!