We use Zoya nail polish for all nail services because it's Toluene and Formaldehyde free. Formaldehyde in nail polish?!? It's true that many beauty products contain ingredients that are linked to endocrine disruption, carcinogens, and birth defects. Not only is Zoya the healthiest nail polish on the market, it also has the coolest colors! To learn more about Toluene and Formaldehyde in beauty products, check out the Environmental Working Group's (EWG) Skin Deep database at www.cosmeticsdatabase.com.