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Toxic PFAS Chemicals in Dental Floss -- Woman Looking at Dental Floss


Some brands of dental floss include PFAS (polyfluoroalkyl substances, a class of chemicals that includes Teflon) to reduce friction. A study in 2019 suggested that PFAS appear to be ingested from floss and make their way into the blood. This is concerning because PFAS have been shown to cause tumors in animals; and in people, higher exposure to certain PFAS is associated with increased cholesterol, effects on the immune system, changes in liver enzymes, increased risk of kidney or liver cancer, thyroid hormone disruption, and low infant birth weights (EPA 2018; CDC 2020). Unfortunately, labels on dental floss are not always clear as to whether or not they contain PFAS.

Sign in as a ConsumerLab member to find out which of 18 popular dental flosses may contain PFAS and which do not, as well as the names of 6 additional dental flosses and 4 dental picks that claim to be PFAS-free. Also see how companies responded when we asked them if their dental flosses contain PFAS, and learn about other products (including some drinking straws, bottled water and processed foods) that contain PFAS, how exposure to PFAS can affect breast milk, what's being proposed in Europe to address the problem of PFAS, and which water filters seem to be best for removing PFAS from tap water.

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September 5, 2021

You state that reverse osmosis filters are most effective at removing PFAS in water but that minerals are also removed with this filtration process. For health reasons should the water be remineralized, and if so, how would you recommend doing this?
September 5, 2021

As we explain in our product review of water pitcher filters (, certain filters (including reverse osmosis filters) can certainly remove essential minerals from water, but the amounts in water are relatively small -- you can get much more from the foods you eat. However, filtration also removes fluoride, which is needed, in small amounts, for strong teeth and bones -- especially by children, so be sure you have another source of fluoride, such as toothpaste containing fluoride.

Joe S.
December 31, 2020

Protocol with dental implants is to place a small amount of plumbers Teflon tape over a retaining screw before cementing a crown or placing a composite resin filling. This poses the question: Does this tape, sitting passively, leach PFAS?

December 30, 2020

I have periodontal disease. I have used COQ10 with success in reducing progression. Actually, has improved.

December 30, 2020

I stopped using Oral-B a long time ago because of this issue & the fact that it is so thin as to be almost unusable. Switched to Dr Tung's & super happy.

May 23, 2021

Dr Tungs is great

June 25, 2021

Where do you buy Dr Tungs?

June 25, 2021

Dr. Tung's is THE BEST!

July 2, 2021

I get Dr Tungs on Amazon.

September 1, 2021

Yes, Dr. Tung’s Smart Floss is superior to Glide floss! I have almost no tartar issues since switching to Dr. Tung’s. My dental hygienist even noticed the difference.

September 12, 2020

I use GUM Soft-Picks® Original. Super-soft rubber bristles. Latex, wood, and metal free. I don't know do they contain PFAS.
September 26, 2020

According to Sunstar Americas (the maker of GUM products), the Soft Picks do not contain any PTFE (polytetrafluoroethylene), which is a PFAS. The only flosser or floss made by Sunstar Americas that do contain PTFE are the Comfort Slide Flossers & Eez-Thru floss (mint & plain).

Carole 20759
August 19, 2020

I use Gum Chucks Flosser with the handles . They work well for me with arthritic fingers. Please comment or review. Thank you!

August 16, 2020

PFAS in Dentek Triple Clean Floss Picks?
August 18, 2020

We reached out to Dentek about this question, and we were told by one of their medical affairs representatives that the Triple Clean Floss Picks are made with polyethylene floss, which would not be expected to contain PFAS. The representative also stated that they "are not aware of Polyfluoralkyl substances (PFAS) being present in any of [their] flossers."

August 16, 2020

I am stuck with Glide because of tight contacts. One thing that can be changed however, is to floss before brushing rather than after. Then rinse thoroughly!

May 23, 2021

I always thought that flossing before brushing was the only way for the brushing to be really effective.

July 26, 2020

Is there any reason to think UHMWPE would be problematic?

Plackers says:

The Right Angle flosser is made with UHMWPE (Ultra-High-Molecular-Weight-Polyethylene). The only flosser made with PTFE (Teflon as many like to call it) is the Gentle Slide.
August 12, 2020

Ultra-high molecular weight polyethylene is non-toxic, so using flossers or flosser picks made with this material would not be a safety concern. The material might not be considered acceptable to those who are environmentally conscious, as it degrades slowly and is not compostable like silk.

July 20, 2020

If PFAS is an integral component of the dental floss fiber and cannot be washed off, how does enough of it even get into our body, to cause a problem?
August 12, 2020

While PFAS are an integral component of the dental floss fiber and cannot be washed off, there is concern that, with use, small amounts may leach into saliva or onto hands. However, the authors of the study note that this still needs to be verified in future research.

July 20, 2020

How effective is brushing teeth with toothpaste right after flossing in reducing PFAS in the mouth?
July 20, 2020

Unfortunately, we don't know, but it's fair to assume that at least some of the women in whom PFAS were found had been brushing and/or rinsing after flossing.

July 19, 2020

Can PFAS be washed off of dental floss? I have a large supply of the Crest/Oral B type, I have tight teeth and need this slippery type. You may think I’m weird, but I already kind of do this; I rinse off and re-use a strand 4 or 5 times before discarding, mainly because I don’t like the added flavoring and this gets rid of it. ;-)
July 20, 2020

It would seem unlikely that washing the floss will remove the PFAS as they are an integral component of the fiber of which the floss is composed.

November 7, 2021

Thank you. I’ve been washing mine too. Time to change!

July 15, 2020

Plackers says,

No PFAS/PFOS was detected in third party testing performed on the Plackers PTFE floss fiber

Maybe someone should clue them in...

July 15, 2020

Is Crest Glide floss manufactured exactly the same, from a PFAS standpoint, as Oral-B Glide floss, and with the same health impacts?
July 15, 2020

We don't have information about the manufacturing process for Crest and Oral-B floss, but the study states "Crest Glide was subsequently rebranded as Oral B Glide by its parent company Procter & Gamble." We've added a note about this in the answer above.

July 13, 2020

My teeth are very closely spaced, and I find that Glide is the only floss to not get stuck. My solution is to floss only part way down and not reach the gum. Then I use the GUM brushes to do the area close to the gum. I'd welcome any professional's comments on the efficacy of this approach. Thank you.

July 13, 2020

POH dental floss is excellent, pure nylon, and free of fluorine and PFAs. I've used POH for the last 20 years, but have not financial interest in Personal Oral Hygiene.
July 13, 2020

POH does not make a claim on their website that their flosses are PFAS-free. However, ConsumerLab was told by a company representative that POH flosses are made from nylon. They also stated: "In the production/manufacture of nylon, there is no reason to suspect that any polyfluoroalkyl substances are present....To the best of our almost sixty years knowledge, there are no poly-fluorinated substances in POH dental floss."

July 13, 2020

Do you have a recommendation for floss picks that do not have PFAs or a safer option for floss picks? Thanks
August 13, 2020

We've added a list of PFAS-free dental picks in the answer above.

August 13, 2020

This is truly the best website with the best information. Thanks for doing what you do and for caring so much about the health of others. Blessings!
August 17, 2020

Thank you for your kind words. We're glad you are enjoying the site!

July 12, 2020

I use dental tape (Walgreen's). Did you by chance evaluate this product?
July 13, 2020

Walgreen's Dental tape was not tested in the study, and, unfortunately, the product website does not list the product's ingredients.

July 12, 2020

I am curious about Gum brand products, both their floss and Proxabrush products, which apparently were not included in the study. For the Proxabush, I use the handle with replaceable "Go-Betweens" refills, but I think even they are made from some plastic material.
July 14, 2020

According to GUM's website, its Eez-Thru flosses are made from PTFE (which is a PFAS) while its Expanding floss is made from nylon ( GUM Proxabrush Go-Between Cleaners are described as having "nylon bristles coated with an antibacterial agent," (

July 12, 2020

What about woven floss? For example, Listerine Gentle Gum Care Mint floss. I find woven floss much easier to handle, both in my hands and in my teeth.

July 12, 2020

After the Oral-B Glide study came out, I tried a few natural options that, frankly, were awful to use. But "Hello" brand activated charcoal floss has been a great alternative for the tight spaces between my teeth and specifically claims "PFAS-free" on the product page. The activated charcoal part is probably a gimmick but that's fine with me.

July 12, 2020

Please look at Kroger Waxed Dental Floss also.

July 11, 2020

Walgreens is one of the largest pharmacy but I did not see anything on their Hi-Tech Dental Floss. I also can not find anything online about it. Is there any information on this product?
July 14, 2020

The website for this product state "Floss material is made of strong microfilaments that fan out to create a broader cleaning surface," and "Slips easily between tight teeth... Will not break, shred or entangle during use," but does not provide further information about the materials used in this floss.

July 9, 2020

This is a bogus study performed by researchers who do not understand the "real" world, where the vast majority of patients have much improved dental health due to Glide. I have practiced dentistry for 45 years and I am a Clinical Associate Professor at the UTHealth School of Dentistry. I have researched this issue extensively and found it to be below the level of having practical relevance.

July 12, 2020

I respect your experience and your researching of this issue. There are many other sources of PFAS and related molecules in the environment, and I am willing to believe that dental flosses may represent only a small amount of a person's PFAS intake. Nevertheless, the EPA website says:
There is evidence that exposure to PFAS can lead to adverse health outcomes in humans. If humans, or animals, ingest PFAS (by eating or drinking food or water than contain PFAS), the PFAS are absorbed, and can accumulate in the body. PFAS stay in the human body for long periods of time. As a result, as people get exposed to PFAS from different sources over time, the level of PFAS in their bodies may increase to the point where they suffer from adverse health effects.

Studies indicate that PFOA and PFOS can cause reproductive and developmental, liver and kidney, and immunological effects in laboratory animals. Both chemicals have caused tumors in animal studies. The most consistent findings from human epidemiology studies are increased cholesterol levels among exposed populations, with more limited findings related to:

infant birth weights,
effects on the immune system,
cancer (for PFOA), and
thyroid hormone disruption (for PFOS).

July 12, 2020

Why "bogus", which implies ulterior intent? Disagreeing with the findings does not make a study bogus. The authors are careful to state their limitations.

July 12, 2020

I don't think PFAS residues in the body are trivial. If using Oral-B Glide floss was associated with a 24.9% higher level of a particular PFAS, as the article states, I would not want to use this floss at all. The article indicates there are many good alternatives. Thanks to ConsumerLab for this useful information.

July 13, 2020

Please provide references to the extensive research mentioned in your post.

Thank you.

July 13, 2020

Many persons prefer not to use anything made with PFAs, for environmental reasons. (For instance, we avoid 'stain-resistant' cotton clothing for this reason: the fiber is treated with Teflon). Further, while floss may have negligible PFAs, there is a concern with the cumulative 'body burden' of environmental toxins over a lifetime.

July 8, 2020

I try to use floss three days per week, but use a ShowerBreeze dental water jet irrigator seven days per week--all done while showering. Both these practices can keep the area under my bridge clean. I don't think a rubber tip or toothpick would work for that.

July 7, 2020

Curious about Listerine floss that is used with the floss stick.

July 6, 2020

Do you have any information about POH floss? I have used this exclusively for many years.
July 6, 2020

The website for this product does not make any claim that it is PFAS-free. We have reached out to the company and will update this comment if we receive a response.

July 6, 2020

Would it be safer to just use unwaxed floss, or is that not enough?
July 6, 2020

It's not clear from the available research if unwaxed floss is less likely to contain PFAS. However, keep in mind that unwaxed floss can also be made from materials such as Teflon.

July 5, 2020

Dr. Mercola's dental floss also has essential oils in it. It also comes in 100 instead of 55 yard lengths
July 6, 2020

The website for this product notes that the floss is made of nylon, and is vegan-waxed, although it does not state that it is PFAS-free.

July 5, 2020

I practiced Periodontics for more than 25 years. I never recommended or required a patient to use dental floss, Instead I taught the use of a Butler Interdental Stimulator (Rubber Tip) and plastic triangular cross-section tooth picks.Neither of these goes below the gum. This idea used to drive some dental hygienists practically crazy, a dental "sacrilege". I considered flossing to be difficult, and crude, but apparently it may also be toxic, DENTAL FLOSS?, you can get along without it, and very well, perhaps better.

July 12, 2020

Flossing is definitely not a very pleasant task, but rubber tips and/or any type of toothpick cannot replace it since these items cannot reach all areas of the mouth. Glide floss at least makes flossing tolerable for most patients. As I noted in another comment, I've been practicing dentistry for 40+ years along with teaching dental students and conducting research in a university setting. The old adage of only flossing the teeth you want to keep is still valid.

July 5, 2020

POH is excellent floss and comes in extra-fine so you don't need Teflon to get it between your teeth.

July 29, 2020

Where do you buy POH floss? Seems like I haven't seen this product on the shelves for a good 40 yrs.

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