Does Hair Dye Expire? Side Effects | 藥妝百科
![Does Hair Dye Expire? Side Effects](https://i.imgur.com/MEXDLMW.jpg)
![Does Hair Dye Expire? Side Effects](https://i.imgur.com/MEXDLMW.jpg)
Hair dye products don’t typically have expiration dates on their package. This can cause confusion for consumers who are wondering if old hair dye still works and is safe to use.
According to manufacturers, unopened hair dye doesn’t expire. They caution, however, that hair dye has a shelf life of about 3 years.
After that period of time, hair dye may not work effectively. There’s no evidence that old hair dye is dangerous to use. However, old hair dye that contains chemicals may cause unwanted side effects to your hair or scalp.
Read on to learn more about hair dye that may be past its prime — and if you should use it or lose it.
When dealing with hair dye that may be expired, the first thing to consider is if the container is open.
Once opened, any type of hair dye may become contaminated by ...
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