The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
so mouth-breathers have changes in the cosmetics of their face and jaw that are really bad in terms of attractiveness, and this was done in twin studies, you can look in the book and see some of this, it's really dramatic how being a mouth-breather tends to make the chin drop back behind the upper mandible, there's a lengthening in the face, a drooping of the eyes, it can be quite dramatic or modest depending on how much mouth-breathing.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
When people mouth breath, there's an elongation of the jaw, drooping of the eyelids, and the entire jaw structure really changes in ways that are not aesthetically favorable.
It's an absolutely spectacular book. You can also just look online "before and after Jaws, Hidden Epidemic" and look at some of the changes in facial structure that occur when people move from mouth to nasal breathing, and it's really quite striking.