Nine in 10 of all the urine samples taken from the expectant moms tested positive for chemicals that fall into one of the three chemical classes of concern, with slightly lower percentages (about seven in 10) with respect to a chemical called triclosan. An antimicrobial, triclosan was banned for use in soap by the U.S. Food and Drug Administration in 2017, but it can still be found in some toothpastes, the researchers noted.