For all gals, have you worry about that all those sanitary pads and panty shields are safe to use?

They are usually made of the absorbable material and with some other chemical to make to as white as "glow in the dark" (just a joke!) So what kind of chemical material to make it whiter? And how long we may got the infected with this chemical when skin contact? And does any other safe substitute commodity (non-chemical manufactured) instead of them?