Periods. Every teenage girl has to deal. Plenty of companies are here to help, with some cringe-inducing advertising. Carefree, Stayfree, Kotex, and now defunct Pursettes.
via Museum of Menstruation
Carefree, 1990 (Germany)
Stayfree, 1980s
Pursettes (now defunct) 1974
Pursettes (now defunct) 1974
Kotex, 1941