If you’ve never worn deodorant then you likely won’t need to wear deodorant as long as you bathe regularly. Once you start wearing deodorant it encourages growth of anaerobic bacteria which leads to foul smelling armpits. For those who have been wearing deodorant who want to get off of it, you can wash your armpits with an iodine rinse solution such as Betadine in the shower for a few days to a few weeks, then you should be free of that ridiculous need henceforth.