It means that the Gel Polish is made without the 10 most common toxical ingredients of former polishes: Formaldehyde, Toluene, Parabens, Camphor, Formaldehyde Resin, Dibutyl Phthalate (DBP), Xylene, Triphenyl Phosphate (TPHP), Ethyl Tosylamide, Fragrances. Please note that anything above 10-free is over overdramatized as a marketing tool.