Is it dangerous to wear a tampon while not on your period?

Using a tampon when not needed is putting yourself at unnecessary risk of Toxic shock syndrome (TSS), vaginal infections, vaginal damage, discomfort, and dioxin exposure.

Tampons absorb vaginal moisture causing damage to vaginal tissues, as well as causing discomfort this gives TSST-1 toxins responsible for TSS a more direct route into your bloodstream so putting you at higher risk of TSS - thus using tampons without any menstrual flow will cause significantly higher damage and higher risk.