When pads are a luxury, getting your period means missing out on life
https://edition-m.cnn.com/2018/10/03/health/tanzania-period-poverty-asequals-africa-intl/index.html?r=https%3A%2F%2Fedition.cnn.com%2F
It shows how difficult it is to remove superstition, when it is against science and medical treatment.
Though the fact that pads are expensive can be solved by financial aid or economic growth, I'm not sure that superstition to avoid pads is eliminated by education.