panty liner

US /ˈpæn.ti ˌlaɪ.nər/
UK /ˈpæn.ti ˌlaɪ.nər/
"panty liner" picture
1.

a thin, absorbent pad worn inside underwear to absorb daily vaginal discharge, light menstrual flow, or light urinary incontinence

:
She uses a panty liner daily for freshness.
You can find panty liners in the feminine hygiene aisle.