Can expired face masks still be used unopened?

Face masks that have not been unpacked can still be used. In fact, as long as the surgical mask, medical mask or N95 mask produced by regular manufacturers is not damaged and the mask is not contaminated, the expiration date can also be used, but the relative protective effect will be reduced.
In fact, the so-called expiration date is only the expiration date of the mask, but the expiration date will not affect the material of the face mask in the short term, so the expired mask can still be used.
However, if the face mask has expired for a long time and the face mask is significantly soiled, it is not recommended that people continue to use the face mask, because it has basically no protection and may increase the risk of disease.