MetaKron Thats why you should change them regually. I mean seriously, my partner changes her pad ever time she goes to the toilet and i assume other women would to. If you change your pad that regually why would you leave one tampon in for a whole day or longer?
They are safe as long as the smallest one that will stop a flow is used and they are changed regually. Also not using them at night would be a good idea too to give it a break
It makes me wonder if magnesium might be part of a good general purpose solution to nasty infections. Obviously a malnourished person is going to be prone to infection.
Good hygiene is important, also. It only makes sense to change pads or tampons as often as practical. I change my underwear more than once a day for similar reasons, whenever it seems needed, just because of sweat and accumulated oily residues.