There"s a range of Tampax tampon absorbency levels to provide protection as your period flow changes. To make sure you choose a sufficiently high absorbency, a Tampax tampon should not need changing for 4 hours. But if you remove a tampon after 4 to 8 hours and white fibre is still visible, it means you need a lower absorbency. When selecting a tampon, you should always choose the lowest absorbency necessary.