Yes, this really does work. I've personally tried only the baking soda, on my dentist's advice, and that did whiten my teeth a bit. It also helped remove some plaque, which is usually a good thing.
The link that I embedded above offers the "recipe" for combining the strawberries and baking soda for a good tooth whitener. The site cautions you to not do this very often, though, because your tooth enamel isn't exactly tough enough to withstand everyday treatment, especially with an abrasive like baking soda.
I'm not sure about strawberries, but baking soda is effective. However, keep in mind it's very abrasive, so I wouldn't brush with it more than a few times a month, and certainly not every night. Otherwise you'll wreck havoc on your enamel.
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