Human sweat itself is odorless until it is fermented by bacteria that thrive in hot, humid environments such as the human underarm. The armpits are among the consistently warmest areas on the surface of the human body, and sweat glands provide moisture. Underarm hair adds to the odor by providing increased surface area on which these bacteria thrive. Body odor is controlled by reducing moisture, killing bacteria or masking the bacteria’s smell with perfume. Deodorants are frequently used to reduce the body odor caused by the bacterial breakdown of perspiration. Subgroups of deodorants are “antiperspirants”, which prevent odor and reduce sweat produced by parts of the body. Antiperspirants are typically applied to the underarms, while deodorants can also be used on feet and other areas in the form of body sprays. Deodorants and antiperspirants come in many forms. What is commonly used varies in different countries. Here in Brazil, aerosol sprays and roll-on are very popular.
Best wishes from Brazil!
Dr. Érica Monteiro