Some people have a condition that causes excessive sweating. The technical term for it is hyperhidrosis. Do you notice that you have sweaty palms or feet also? If you do have this condition, it's likely that deodorant won't help you eliminate the problem. Some people have tried surgical remedies, such as botox injections, to eliminate the problem, but there are natural and less expensive ways you can treat excessive sweating. See here for more information: http://www.megavista-health.com/articles/health-conditions/sweating