An anti-perspirant contains aluminium salt, a material that forms gels in some of the sweat ducts on the skin once perspiration has started to occur. This reduces the amount of perspiration produced under the arm.
The aluminium salt and the perfume help to combat odour as the aluminium salt reduces the amount of bacteria on the skin and the perfume helps to mask any odour generated.
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The areas that produce the most sweat are the forehead, upper lip, hands and feet. You sweat least from your arms and legs.