Tampons have an expiry shelf life of five years from the date of manufacture. This is only effective if the package is not opened, disturbed, or exposed to moisture. The tampons packaging is not sealed and labeled sterile, so poor storage can lead to mold and bacteria growth. While the bathroom may be the most convenient place, it is important to always store your tampons in a cool and dry place. Use of expired tampons is not advisable even if they look fresh and new. Mold and bacteria are not always visible and can be hidden in the tampon or the applicator.