Quote:
Originally Posted by JuliaC
What do you mean exactly?
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Everytime you open your mascara and use it, it is exposed to air causing chemical reactions which will make it dry out and as The_Ida pointed out, bacteria, the ones on your lashes as well as those around you (and keep in mind that you'll put the wand back into the tube).
To be honest, I couldn't care less about bacteria myself but I do think that the quality of any mascara suffers a lot the more you use it.