Use a water flosser and a tongue scraper daily to mechanically remove plaque and bacteria inaccessible through standard brushing.

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Science largely supports the idea that interdental and lingual cleaning effectively complements brushing.

noli's read

Science largely supports the idea that interdental and lingual cleaning effectively complements brushing. Water flossers are recognized for reducing gingival inflammation and plaque, as shown by a systematic review published in the Journal of Clinical Periodontology (meta-analysis/RCT). Tongue scraping is also supported by observational evidence and clinical trials for reducing the bacterial load responsible for halitosis (bad breath). However, presenting this as an absolute necessity for overall systemic health may be slightly exaggerated, as brushing and flossing remain the fundamental pillars. No evidence suggests that these tools replace professional dental care or rigorous comprehensive oral hygiene. It is a solid, complementary strategy validated by research to optimize local hygiene.

the sources

Claimed by Bryan Johnson (Blueprint). Noli grades the claim, never the person.

Decoded by Noli · July 18, 2026 · the original post

Noli has read similar claims

Other advice in the Register that leans on the same research.

Regular sauna use (especially dry sauna) is associated with better cardiovascular longevity — but the claim that jumping into cold water right after "undoes" that benefit, or that icing your testicles protects fertility, are untested extrapolations layered on top of a real association.

mixedBryan Johnson

Dry Finnish sauna is the best-studied form for long-term cardiovascular benefit, at several sessions a week; but the claim that sweating clears microplastics from the body has no source — it's a leap from a study about heavy metals, not microplastics.

mixedBryan Johnson

There's a real mechanism behind part of this idea — heat trapped by tight underwear affects male fertility — but stretching it into a universal "anti-aging" habit (circulation, inflammation, skin barrier, hormones, deep sleep, for everyone) goes well beyond what the research shows.

overstatedJessica Lee

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