How often should I change my tampon?How do you know when to change a tampon?Can I use a tampon overnight?Can tampons be used for discharges other than menstrual fluid?Can I use two Tampax® tampons at the same time?Is a tampon easy to take out?When can a girl start using tampons?
"Never leave a tampon in for more than 8 hours when on your period. If you find you have to change your tampon more frequently than every four hours, you may need to use a tampon with a higher absorbency. On the other hand, if you change a tampon after wearing it for eight hours and find that it's still slightly dry or is uncomfortable to remove, you should switch to a tampon with a lower absorbency. Always use the lightest absorbency for your flow.
Changing a tampon too frequently can affect the tampon's ability to absorb menstrual flow -- that's because the tampon needs a little moisture to expand."