There have been many questions surrounding the labeling of nail polishes being 5 Free, 7 Free, or 9 Free. Here is the real difference: Generally, nail polish will, at the very least, be 3-Free. 3-Free means that the nail polish is free of what is known as the “Toxic Trio,” which are Dibutyl Phthalate, Formaldehyde, and Toluene. These ingredients are commonly used to assist in reducing cracking and improving flexibility. Chip free formulas often still contain these ingredients, so always read the labels if you are concerned. 5-Free nail polish is the universal standard now. While even free of the “Toxic Trio,” it is also free of formaldehyde resin and camphor. In addition to 3-Free and 5-Free, many companies are increasing the number of chemicals they are removing. Our polishes are 7-Free. 7-Free means that they are free of ethyl tosylamide and xylene. The number of ingredients that nail polishes tend to claim to be free of keeps on climbing. Currently, there are also 8-Free products and 9-Free products. However, while accurate in a way, these ingredients are often ones that are not typically used in nail polishes anymore or that pose no real harm to the user.