I think that whitening toothpaste can be bad for gums, depending on which brand you pick - some are harsher and more abrasive than others. This article recommends using a soft toothbrush and gentle strokes. Also, if you have very sensitive gums, you may want to avoid a peroxide-containing formula.
I read somewhere that Sensodyne Extra Whitening toothpaste is a good choice for people with sensitive teeth and gums. I'm interested in trying it, but it's a bit more expensive than my normal, non-whitening toothpaste. Does anyone have experience with the Sensodyne toothpaste? Does it work as well as they claim? Is it worth the extra cost?