You count on a box of baking soda to keep your refrigerator smelling fresh; why wouldn't you trust it to do the same for your armpits? Baking soda is quite the miracle product, as it can keep everything from a cat's litter box to a sewage treatment plant on odor lockdown [source: Horovitz]. The chemical composition of baking soda reacts with odor molecules so that they'll be neutralized on impact. And baking soda doesn't just address smell, but wetness as well. Unlike regular antiperspirants, nothing in baking soda will prevent sweat from escaping your glands. However, baking soda will soak up excess perspiration so that your underarms feel dry.