The Bottom Line
Technically, deodorant doesn't have an expiration date. It's likely antiperspirants will work for years as well. But to be on the safe side, you should probably replace the stick every three years, if you still have it.
What will happen if you use expired deodorant?
Using expired deodorant or antiperspirants won't likely harm your health. However, the formula or fragrance of the product may deteriorate so, if you've opened or used your deo, you should replace it every six to 12 months for best results (closed deodorants can last for more than a year).
Can bacteria grow on deodorant?
Deodorant could be allowing more harmful bacteria to grow in underarms, research suggests.
