PFAS in Dental Floss: Health Risks and Safer Alternatives

Understanding PFAS in Dental Floss

When you reach for dental floss to clean between your teeth, you may be exposing yourself to harmful chemicals known as PFAS—per- and polyfluoroalkyl substances, often called “forever chemicals.” These synthetic compounds have been engineered to repel water and grease, making products slippery and easy to use. However, recent testing has revealed that many popular dental floss brands contain significant levels of PFAS, raising serious health concerns for consumers who use these products daily.

PFAS chemicals are persistent in the human body and environment, accumulating over time with each exposure. The waxy coating on many floss products that gives them their smooth glide may actually be delivering dangerous chemicals directly into your mouth and potentially your bloodstream, especially when flossing causes gum bleeding.

What Are PFAS Chemicals?

PFAS represent a family of nearly 12,000 different chemicals used across numerous industries to create non-stick, water-resistant, and stain-resistant products. These compounds are found in countless everyday items, including:

• Non-stick cookware coated with Teflon
• Stain-resistant carpeting and furniture
• Water-resistant and waterproof clothing
• Food packaging materials
• Cosmetics and personal care products
• Firefighting foams used at airports and military bases
• Various dental products including floss and toothpaste

The widespread use of PFAS chemicals has resulted in their presence in the blood of nearly all Americans, with testing of umbilical cord blood and breast milk indicating that human exposure begins before birth. Because PFAS bioaccumulate—meaning they build up in the body over time—even low-level exposures from multiple sources pose significant health risks as chemical concentrations increase.

Testing Reveals Alarming PFAS Levels in Popular Floss Brands

In a comprehensive study, Mamavation (a wellness site) and Environmental Health News (EHN.org) tested 39 different brands of dental floss for PFAS contamination. The results were concerning: approximately one-third of the tested samples contained detectable levels of PFAS chemicals. The contamination levels varied dramatically, ranging from 11 parts per million (ppm) to an alarming 248,900 ppm.

Most disturbingly, four products tested contained more than 70,000 ppm of PFAS, representing 7 percent of the product’s composition by weight. The worst offender was Oral-B Glide, which tested at 248,900 ppm—nearly 25 percent of the product. This extraordinarily high concentration means that one of the most popular floss brands in America contains a significant portion of forever chemicals, delivered directly to the mouth with each use.

Top Contaminated Products

Health Risks Associated with PFAS Exposure

The presence of PFAS in dental floss is particularly concerning because scientific research has linked these chemicals to numerous serious health conditions. The toxic effects of PFAS exposure include:

• Reproductive and fertility problems: Studies indicate PFAS can interfere with reproductive function and fertility in both men and women
• Birth defects and developmental issues: Prenatal PFAS exposure has been associated with developmental abnormalities in offspring
• Cancer risk: Certain PFAS chemicals are linked to testicular cancer, kidney cancer, and other malignancies
• Immune system impairment: PFAS exposure suppresses immune function, reducing the body’s ability to fight infections and diseases
• Heart disease: Some PFAS chemicals are associated with cardiovascular complications and elevated blood pressure
• Hormone disruption: PFAS chemicals interfere with endocrine function, hijacking hormone systems throughout the body
• Kidney and liver damage: Prolonged PFAS exposure can cause organ damage and dysfunction
• Elevated cholesterol levels: PFAS exposure is linked to increased cholesterol that may not respond to standard treatments

Why Dental Floss Is a Particular Concern

The mouth is an especially vulnerable entry point for PFAS contamination from dental floss. Unlike other consumer products containing PFAS, floss is inserted directly into the oral cavity where it makes contact with delicate tissues. When flossing causes gum bleeding—a common occurrence during routine oral hygiene—PFAS chemicals gain direct access to the bloodstream through open wounds.

A groundbreaking study found that women who used Oral-B Glide dental floss had significantly higher levels of PFHxS (perfluorohexanesulfonic acid), a type of PFAS, in their blood compared to women who did not use that specific floss product. Researchers tested 18 dental floss samples for fluorine, a marker of PFAS presence, and confirmed that multiple floss products contained these toxic chemicals. Lead researcher Katie Boronow from Silent Spring Institute stated, “This is the first study to show that using dental floss containing PFAS is associated with a higher body burden of these toxic chemicals.”

The Bioaccumulation Problem

One of the most dangerous aspects of PFAS is their ability to bioaccumulate in the human body. Unlike many other pollutants that the body can metabolize and eliminate, PFAS chemicals persist indefinitely, building up with each exposure. This means that even low levels of PFAS in dental floss represent a cumulative exposure risk over months and years of regular use. A person who flosses daily with a contaminated product could be exposing themselves to PFAS thousands of times throughout their lifetime, with each exposure adding to their body burden of these toxic chemicals.

Safe Alternatives to PFAS-Containing Floss

The good news is that PFAS is not a necessary component of dental floss. Manufacturers can and do produce effective floss products using safer, natural coatings that provide the same functionality without the health risks. Safe alternatives to PFAS-containing floss include products coated with:

• Beeswax: A natural wax produced by honeybees that provides a smooth glide without synthetic chemicals
• Carnauba wax: A plant-based wax derived from palm leaves that offers excellent water and grease resistance
• Candelilla wax: Another natural plant wax that provides effective lubrication properties
• Silk floss: Naturally biodegradable floss made from silk fibers, often coated with natural waxes
• PTFE-free nylon floss: Synthetic floss that doesn’t contain perfluorinated compounds

When shopping for dental floss, look for products explicitly labeled as “PFAS-free” or containing only natural wax coatings. Many brands now market their products as free from forever chemicals, making it easier for consumers to choose safer options.

Regulatory Action and Legislative Changes

Recognition of the PFAS problem has prompted regulatory action in some jurisdictions. Minnesota recently passed groundbreaking legislation that will ban PFAS in dental floss and 10 other product categories starting in 2025. After 2032, PFAS chemicals will be prohibited in nearly all consumer products sold in Minnesota, except in cases where regulatory agencies determine use is unavoidable. This landmark legislation represents the first significant state-level effort to restrict PFAS in consumer goods and may serve as a model for other states and the federal government.

Terry Collins, Teresa Heinz Professor of Green Chemistry and Director of the Institute for Green Sciences at Carnegie Mellon University, has called for stronger action, urging companies and trade associations like the American Dental Association to “stop approving of any dental product that contains any forever PFAS compound.”

Complex Findings on Floss Usage and PFAS Exposure

Interestingly, recent research from the National Health and Nutrition Examination Survey (NHANES) examining data from 6,750 adults revealed a more nuanced relationship between dental floss usage and overall PFAS body burden. While dental floss users showed higher serum concentrations of PFOA (perfluorooctanoic acid), they paradoxically demonstrated lower overall PFAS burden scores compared to non-users. This suggests that the relationship between dental floss and specific PFAS compounds is complex and may be influenced by other exposure sources in a person’s environment.

However, researchers emphasize that these findings do not minimize the importance of choosing PFAS-free floss, particularly given the direct mouth exposure and potential for gum bleeding to facilitate chemical absorption. The variation in findings underscores the need for continued research and the importance of consumers taking protective measures by selecting floss products explicitly formulated without forever chemicals.

Tips for Reducing PFAS Exposure from Oral Care Products

• Choose PFAS-free floss: Select dental floss products labeled as free from PFAS, perfluorinated compounds, or forever chemicals
• Look for natural coatings: Prioritize floss coated with beeswax, carnauba wax, or other natural materials
• Check product labels: Read ingredient lists carefully and contact manufacturers if the ingredient list is unclear
• Avoid major contaminated brands: Be particularly cautious with high-contamination products like certain Oral-B Glide variants
• Consider alternative cleaning methods: Use water flossers, interdental brushes, or other cleaning tools as alternatives to traditional floss
• Reduce overall PFAS exposure: Limit use of other PFAS-containing products, including non-stick cookware and water-resistant fabrics
• Support legislation: Advocate for regulations banning PFAS in consumer products

The Bottom Line on Dental Floss and PFAS

While dental flossing remains an important part of oral hygiene routines recommended by dental professionals, the choice of floss product matters significantly. The presence of PFAS in approximately one-third of tested floss brands represents a preventable exposure to toxic chemicals that accumulate in the human body and have been linked to serious health conditions including cancer, reproductive problems, and immune system dysfunction.

Consumers do not need to choose between oral health and chemical safety. Numerous PFAS-free alternatives provide effective cleaning without introducing forever chemicals into the mouth and bloodstream. By selecting dental products explicitly formulated without PFAS and other harmful chemicals, individuals can maintain excellent oral hygiene while minimizing exposure to persistent toxins.

As regulatory bodies continue to address the PFAS crisis and manufacturers increasingly develop safer formulations, the availability of non-toxic dental floss options will expand. Taking action now—by switching to PFAS-free products and supporting legislation to restrict forever chemicals—protects both personal health and environmental quality for future generations.

Frequently Asked Questions (FAQs)

Q: Is dental floss necessary for oral health?

A: Yes, dental floss remains an important part of comprehensive oral hygiene. It removes plaque and food debris from between teeth and beneath the gum line, where toothbrushes cannot reach. However, you should use PFAS-free floss to maintain oral health without chemical exposure.

Q: How can I tell if my floss contains PFAS?

A: Check the product label for terms like “PFAS-free,” “forever chemical-free,” or natural coating materials (beeswax, carnauba wax, candelilla wax). Contact the manufacturer directly if ingredients are not clearly listed. Look for studies or testing results specific to the brand you use.

Q: What should I do if I’ve been using floss with PFAS?

A: Switch to a PFAS-free floss immediately. While you cannot eliminate PFAS already in your body, stopping exposure prevents further accumulation. Continue flossing daily for oral health, just with a safer product. Consider consulting a healthcare provider if you have health concerns.

Q: Are all Oral-B floss products contaminated with PFAS?

A: The testing specifically identified Oral-B Glide as the most contaminated product. While not all Oral-B products may contain the same high levels, consumers concerned about PFAS should look for alternative brands or specifically seek out Oral-B products marketed as PFAS-free.

Q: Can PFAS be absorbed through the mouth?

A: Yes, particularly when flossing causes gum bleeding. The mouth provides direct access to the bloodstream, and PFAS chemicals can be absorbed through damaged gum tissue. This is why choosing PFAS-free floss is especially important for oral care products.

Q: What are the best PFAS-free floss options?

A: Look for floss products coated with natural materials like beeswax, carnauba wax, or candelilla wax. Many brands now explicitly label their products as PFAS-free. Silk floss and water flossers are also alternatives worth considering. Research specific brands or consult dental professionals for recommendations.

Q: Will banning PFAS in Minnesota affect floss availability nationally?

A: Minnesota’s 2025 ban on PFAS in dental floss will likely influence national manufacturers to reformulate products, potentially making PFAS-free options more widely available. This regulatory action may prompt other states to adopt similar restrictions, accelerating the industry shift toward safer alternatives.

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Author

medha deb

 

Medha Deb is an editor with a master's degree in Applied Linguistics from the University of Hyderabad. She believes that her qualification has helped her develop a deep understanding of language and its application in various contexts.

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