I saw this suggestion (http://www.health.com/health/article/0,23414,1136070,00.html) about combining a strawberry and baking powder to use for whitening your teeth.  While this will work, I wish they had reminded people that some baking powder contains Aluminum Sulfate.  This is not a dangerous ingredient, but the fact that it is used as an accelerator in concrete or a foaming agent in fire fighting foam makes me a little hesitant about consuming it.  Just a little warning, that you may want to consider buying baking powder without this ingredient or simply make it yourself.  I have not tried making it, but it does seem like it would be easy to make baking powder.