Chemical and Aluminium based deodorants can close pores to control smell and sweat. This is actually a bad thing for your body. Most essential oils will open pores rather than close them. It is better to keep your pores clean of bacteria. One way to help control bacteria is to clean your armpits with an astringent like Tea Tree or Lavender before applying the the deodorant. If you do not mind the mess, apply dead sea mud to your armpits, let dry, and then shower. This will clear out the bacteria for 3 days.
It can take up to 2 weeks for your body to adjust to a natural deodorant.