Of all the habits associated with longevity research — fasting, cold exposure, zone 2 cardio, sleep optimization — flossing is almost never in the conversation. It probably should be.
A study of more than 5,000 older adults found that people who never flossed had a 30% higher mortality risk than those who flossed daily. That’s a substantial association for a habit that takes less than two minutes, costs almost nothing, and requires zero equipment beyond a spool of string.
The connection isn’t just about cavities. Researchers have identified a specific oral bacterium — Porphyromonas gingivalis — as a likely mechanism. This pathogen, which thrives in the spaces between teeth that toothbrushes can’t reach, is associated with gum disease and periodontitis. It’s also been found in atherosclerotic arterial plaque and in the brain tissue of Alzheimer’s patients.
The implication: bacteria that start in your gums don’t necessarily stay there. Studies published in the AHA Journals have linked poor oral hygiene to elevated stroke and cardiovascular risk. Research in PubMed connects it to cardiovascular disease mortality. More recently, studies have found associations between flossing habits and reduced rates of dementia and Alzheimer’s disease — findings striking enough to prompt several longevity researchers to start treating oral hygiene as a cardiovascular and neurological intervention, not just a dental one.
The Mechanism in Plain Terms
Your toothbrush cleans about 60% of your tooth surface. The other 40% — the tight gaps between teeth and the gumline — requires floss to clear. When biofilm (dental plaque) accumulates there, it creates an environment where P. gingivalis and related bacteria proliferate. Left undisturbed, they can enter the bloodstream through inflamed gum tissue, triggering systemic inflammation and contributing to the arterial and neurological damage documented in the research above.
The Right Way to Do It
Evidence still supports traditional string floss as the most effective option — it can navigate below the gumline in a way that picks and water flossers can’t replicate consistently. Curve the floss into a C-shape around each tooth and use an up-and-down motion rather than a sawing motion. Dentists recommend doing it at night, since you’re about to seal your mouth for several hours with whatever biofilm is sitting between your teeth.
Thirty seconds per day. The research says it’s one of the better investments you can make.
Sources: PMC3124861 · PubMed 39520447 · AHA Journals
Joseph has been writing and editing for a wide variety of publications over the last decade. He loves covering news in the health and wellness space and has written extensively about all aspects of wellness for a wide range of publications.
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