Teeth whitening tips?

whitening kits,strips and trays are expensive and never really work for me but,i brushed with baking soda and it REALLY worked,does anybody have any other ideas?

TIP on the bad breath: floss, don’t eat sugar or drink pops after brushing your teeth, keep your mouth hydrated with water, if your going to chew gum, chew no-sugar mint gum
buy tongue scarper to clean the back of your tongue (which is mostly where the bacterias are)

To whiten your teeth: eat some strawberries, Strawberries are known to contain malic acid, which does wonders in removing stains on your teeth.
You can buy hydrogen peroxide (be careful and read the instruction first, DO NOT SWALLOW)

[mage lang="en|es|en" source="answers"]Bad Breath Kit[/mage]