let me try to help you out here. you ask a very good question. first let me tell you i know of no link between use of sanitary pads and ovarian cancer. perhaps the person who told you that was thinking of toxic shock syndrome which can occur when women use super-absorbent tampons and do not change them frequently enough. because you use pads toxic shock syndrome is not a major concern for you. for purely hygienic purposes i'd recommend changing your pad every four to five hours no matter how saturated it may be. the same goes for panty liners when used toward the end of your period when the flow is very light. changing pads fairly frequently will help you feel cleaner and avoid any odor problems. i hope this answers your question!
when to replace a sanitary pad during periods? . if a pad does not get saturated after many hrs than it should be replaced or not? i need to know the time/ hrs after a pad should be replaced because i've heard that a pad should be replaced after 5 hrs otherwise it can cause ovarian cancer because blood mix with gel & make a substance that is harmful i want to know is that true?