[Frankss]

Not the mask themselves. The filters have an expiration date

[flaglady47]

“Not the mask themselves. The filters have an expiration date”

Thanks, I thought so. But isn’t it true they have to be tight fitted? So as a child grows, a new mask would become necessary?

[2001convSVT]

The charcoal filters usually have a printed expiration date, but as long as the air tight seals are intact they will still be effective long after the expiration date.