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Why are aluminium salts commonly included in most deodorant formulations?

1. They function as antiperspirants
2. They work as antibacterial substances
3. They cover up body odour
4. They perform all of these roles

Correct answer: They function as antiperspirants

Solution

Aluminium salts such as aluminium chlorohydrate are added to deodorants because they act as antiperspirants: they form a temporary gel plug in the sweat ducts and reduce perspiration, which in turn limits the bacterial breakdown that causes odour.

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