Women have long been advised to change the tampon regularly to avoid the toxic shock syndrome, a rare and potentially fatal condition caused by staphylococcus aureus. I know that I have personally written about it.
In recent years, new menstrual hygiene products have appeared, such as organic cotton tampons and washable menstrual cups.
Organic cotton tampons are often shown to be safer than conventional tampons. In reality, they do not prevent the risk of contracting toxic shock syndrome.
Menstrual cups can also lead to toxic shock syndrome, and women who use them should boil them before each use. Contrary to popular belief, menstrual cups actually seem to allow an even greater development of bacteria than tampons, which can also be explained by the air they let through.