How does deodorant work, and why it stops working after a few hours?

Deodorant kills the bacteria that grow in the armpits so they don’t make the smell we associate with body odor, and usually also smells nice.

Antiperspirant, on the other hand, blocks the sweat glands so that they don’t extrude the sweat that the bacteria feed on to make body odor.

In both cases, they stop working when the active chemical isn’t present in a high enough concentration to keep working.

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