Not "dental floss" but specifically floss which contained PFASs. Other culprits were Teflon cookware and cardboard food packaging. The dental floss results are

Not "dental floss" but specifically floss which contained PFASs. Other culprits were Teflon cookware and cardboard food packaging. The dental floss results are hidden in the Supplementary Information document linked in the original Nature article: https://www.nature.com/articles/s41370-018-0109-y#MOESM1 https://www.nature.com/articles/s41370-018-0109-y#MOESM1 https://static-content.springer.com/esm/art%3A10.1038%2Fs41370-018-0109-y/MediaObjects/41370_2018_109_MOESM1_ESM.docx https://static-content.springer.com/esm/art%3A10.1038%2Fs413... These products contained fluorine, a marker for PFASs, as determined by particle-induced γ-ray emission (PIGE) spectroscopy: Colgate Total Dental Floss Mint CVS Health SuperSlip Ease Between Waxed2 Oral-B Glide Pro-Health Mint Oral-B Glide Pro-Health Original Crest Glide Deep Clean Cool Mint Floss3 Signature Care Mint Waxed Comfort Floss2 These products were found not to contain any fluorine: CVS Unwaxed Desert Essence Tea Tree Oil Dental Tape EcoDent Gentle Floss Premium Dental Floss with Essential Oils Mint Vegan Waxed Johnson & Johnson Listerine Cool Mint Mint Floss Johnson & Johnson Reach Clean Paste Icy Mint Woven Floss Johnson & Johnson Reach Mint Waxed Reach Mint Waxed Reach Waxed Unflavored Oral-B Complete Deep Clean Ultra Mint Oral-B Satin Floss Mint Rite-Aid Premium Waxed Mint Floss2 Tom's of Maine Naturally Waxed Antiplaque Flat Floss