Titanium dioxide particles frequently present in face masks intended for general use require regulatory control, Verleysen, Eveline, Ledecq Marina, Siciliani Lisa, Cheyns Karlien, Vleminckx Christiane, Blaude Marie-Noelle, De Vos Sandra, Brassinne Frederic, Van Steen Frederic, Nkenda Régis, et al. , Scientific Reports, Jan-12-2022, Volume 12, Issue 1, (2022)