If you're not a coffee-drinker or a smoker, what is a good way to whiten your teeth at home?

I've never in my life been a smoker, because I'm sixteen. Haha. And I almost NEVER drink coffee, because I don't really like it too much. I brush my teeth every so often with baking soda, and use regular Crest Multi-care Whitening toothpaste. Should this whiten my teeth a decent amount?
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there are tons of whitening strips you can purchase at ur local walmart....from what I hear, they work just as good as actually going to a dentist.
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