Experts are weighing in on whether or not we REALLY NEED deodorant. Some say, it's not like brushing and flossing where if we don't do those things daily, it can cause health issues. They say the fact that deodorant is part of our hygeine routine is more because natural body odor is considered culturally offensive to many.
Experts say that if you don't wear an anti-persperant, you will sweat and that can cause issues due to bacterial overgrowth. However, they say that a good, thorough bath or shower, should take care of that.
So, really, I guess it comes down to social acceptance rather than need. I, for one, will continue to be socially accepted...at least in terms of scent.