Do tampons have an expiry date?

No, tampons don't expire because of the materials used and sanitation to reduce bacteria being present in the tampons - some tampons may have an expiry date on the box, this is to do with potential bacterial growth, but this is uncommon. However tampons are only sanitary not sterile so they can still contain bacteria and even mold, if tampons aren't kept in a clean dry place they will not be safe to use. Although tampons don't expire it's still not a great idea to use tampons that are a few years or even decades old - yes, sometimes you do find tampons this old.