The myth of polish is that your nails are barriers to the toxic chemicals they contain. But then there is the evidence. Like health problems salon workers endure because of toxic exposures. Or so-called “big three free” nail polish exposed to contain hidden toxic chemicals. Now add TPHP and DPHP to the mix. These toxic nail polish chemicals were recently discovered in a new toxic nail polish chemical biomonitoring study conducted by Duke University and the Environmental Working Group. The results aren’t pretty, but there’s something you can do about it.