”When adult armpits are washed with alkaline pH soap, the skin loses its acid mantle (pH 4.5 - 6), raising the skin pH and disrupting the skin barrier. As many bacteria thrive in this elevated pH environment, this makes the skin susceptible to bacterial colonization. […] Underarm hair wicks the moisture away from the skin and aids in keeping the skin dry enough to prevent or diminish bacterial colonization. The hair is less susceptible to bacterial growth and therefore is ideal for preventing the bacterial odor.”
I think deodorant mostly is an example of capitalism creating demand where none exists.