Deodorant is spread into the armpit to help mask the smell of sweat. They do not cause your armpits to sweat less, though. Antiperspirants plug the sweat glands up in your armpits so that you do sweat less. Most antiperspirants also have a deodorant in them as well, to not only help you to sweat less, but reduce any odor caused by the sweat in your armpits.
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