Tampons rarely cause infections leading to Toxic Shock Syndrome (TSS). Tampons work like an absorbent plug. Once you insert them into your vagina they soak up your menstrual blood and the muscles in your vagina will hold it in place so it can’t get lost in your body. You shouldn’t be able to feel it once it’s in place.
When it comes to changing your tampon, it’s recommended to change them after four to eight hours. To stay on the safe side leaving it no longer than six hours will cut your risk of infection. If you sleep for no longer than eight hours then it’s a good option for when you’re on your period so long as you change it as soon as you wake up.
It’s really important to choose the lowest absorbency necessary for your menstrual flow. And because your flow varies from day to day, it’s likely that you’ll need to use different absorbencies on different days of your period. Figuring out absorbency can be confusing at first. But let’s make it easy—if your tampon is uncomfortable to change, go down a size. If your tampon leaks, go up a size.