Should I buy 3-free, 5-free, 6-free or 7-free nail polish?
Too many numbers! What’s going on? 3-free polish does not contain dibutyl phthalate, toluene or formaldehyde. 4-free polish does not contain dibutyl phthalate, toluene, formaldehyde or formaldehyde resin. 5-free polish does not contain dibutyl phthalate, toluene, formaldehyde, formaldehyde resin or camphor. 6-free polish does not contain dibutyl phthalate, toluene, formaldehyde, formaldehyde resin, camphor or parabens. 7-free polish does not contain …