New research shows that some nail polish contains a toxic chemical known as TPHP or triphenyl phosphate.
In the early 2000s, many nail polish companies removed a toxic chemical that was used to enhance a polish's texture and function.
Since then, even more chemicals have been eliminated.
But, it appears that other chemICals may have been added and those chemicals could also be dangerous.
The study was published in the journal "Environmental Science & Technology."