Deodorant just clogs your pores and makes your body try harder to sweat.
I use talcum powder if I know I'm going to be sweating, otherwise I wear nothing.
When I stopped wearing deodorant it took about a month to really notice the difference, but I stopped sweating under my arm pits unless I was physically asserting myself a lot.
AH I remember being young and no needing to put on deodorant hell I would not even wear it going to work I never needed too. now my ass smells and I need it HA.