Deodorants versus antiperspirants

Often the terms deodorants and antiperspirants are used interchangeably, but there is in fact a significant difference between the two.

Deodorants
Deodorants do not stop sweat. They work by temporarily neutralise the smell from the bacteria living on the skin in the armpits. Many deodorants contains fragrance which only mask bad odour. 
 
Antiperspirants
Antiperspirants decrease or halt the production of perspiration in the sweat glands. Basically, a temporary plug is formed in the opening of the sweat gland.
The plug is naturally dispelled within a few days. The duration of the effect varies from a few hours to several days.

Learn more about how Perspirex works.

Did you know?
The active ingredient in antiperspirants is usually aluminum salts. Aluminum chloride has been used to combat excessive perspiration since the beginning of the 1900s. For the first many years aluminum salts in a water solution was used. Later, an alcohol solution, which has considerably more long term effect, was introduced.