A new study suggests certain types of consumer behaviors, including flossing with Oral-B Glide dental floss , contributes to elevated levels in the body of toxic PFAS chemicals. PFAS are water and grease-proof substances that have been linked with numerous health problems. The findings provide new insight into how these chemicals end up in people's bodies and how can they limit their exposures by modifying their behavior.

The study, led by Silent Spring Institute in collaboration with the Public Health Institute in Berkeley, CA, appears online January 8 in the  Journal of Exposure Science & Environmental Epidemiology  (JESEE), and is part of a special issue dedicated to PFAS (Peru). and polyfluoroalkyl substances). PFAS are used in a range of consumer products, including fast food packaging, non-stick pans, waterproof clothing, and stain-resistant carpets .

People can be exposed to the substances directly through the products they use and the food they eat. They can be exposed through indoor air and dust and contaminated drinking water . Scientists are concerned about widespread exposure to PFAS in the population because they have been linked with health effects including kidney and testicular cancer, thyroid disease, high cholesterol, low birth weight, decreased fertility, and effects on the immune system. 

Blood S amples

In the new study, we measured 11 different PFAS chemicals in blood samples taken from 178 middle-aged women enrolled in the Public Health Institute's Child Health and Development Studies, a multigenerational study of the impact of environmental chemicals and other factors on disease. To understand how people's behavior influences their exposure to PFAS.

The researchers then compared the blood measurements with results from interviews in which they asked the women about nine behaviors that could lead to higher exposures. Half of the women in the analysis were non-Hispanic white and half were African American. Women who flossed with Oral-B Glide tended to have higher levels of a PFAS called PFHxS (perfluorohexanesulfonic acid) in their body compared with those who did not.

To further understand the connection, the scientists tested 18 dental flosses (including 3 Glide products) for the presence of fluorine – a marker of PFAS using a technique called particle-induced gamma-ray emission (PIGE) spectroscopy.

All three Glide products tested positive for fluorine , consistent with previous reports that Glide is manufactured using Teflon-like compounds.

In addition, two store brand flosses with " compare to Oral-B Glide " labeling and one floss describing itself as "single strand Teflon fiber" tested positive for fluorine. "This is the first study to show that using dental floss containing PFAS is associated with a higher body burden of these toxic chemicals," says lead author Katie Boronow, a staff scientist at Silent Spring. "The good news is, based on our findings, consumers can choose flosses that do not contain PF AS. "