Inferior pigments cause cancer: there are natural pigments and artificial pigments. Of course, artificial pigments are most widely used now, but many artificial pigments are toxic and may be harmful to human body. Sudan red, as we all know, is a carcinogen. Natural pigments may be mixed with harmful components, but they can be purified and removed. However, due to technical difficulty and high cost, it is generally not adopted by manufacturers. Solvent is harmful to health: the solvent components of nail polish are basically toxic and harmful substances, of which phthalate and formaldehyde have the greatest effect, followed by acetone and ethyl acetate. Phthalates can interfere with the normal hormone balance, leading to serious reproductive damage and other health problems; Phthalates and formaldehyde are carcinogens. Acetone and ethyl acetate can make nail polish dry quickly because of their strong volatility, but they are both dangerous chemicals, flammable and explosive. When they volatilize, they will produce a dizzy and irritating smell, which will pollute the indoor air. Long-term inhalation may cause harm to the nervous system. So don't use nail polish in an unventilated place to avoid adverse effects.