Check out my post on ToothSoap, I love the stuff! I’ve heard of the baking soda paste, and it sounds like an excellent idea, but my enamel is way too thin for that. Using baking soda would only worsen the problem. (Though I may try it in the future if I need to whiten them!)
And THANKS, I accidentally deleted my former one, so I’ve been desperately searching for something new! 8-)