Related observations:<p>1) Ötzi had cavities and gum disease.<p>“Ötzi, a Stone Age man who died atop a glacier about 5300 years ago, suffered from severe gum disease and cavities.” [1]<p>2) Sailor Steven Callahan, after 72 days adrift in the Atlantic ocean, where he subsisted on fish and birds, after being rescued:<p>"When I wake up in the morning, I look into the mirror. My God! Who's that? The face I see is straight out of Robinson Crusoe. Long, stringy bleached hair, hollow eyes, drawn brown skin, shaggy beard. Michelle Monternot gives me a toothbrush. It feels strange in my mouth. What's even stranger is that my teeth are not crusty and slimy but are remarkably clean. I wonder what my dentist would say about that." [2]<p>[1] <a href="https://www.science.org/content/article/scienceshot-iceman-had-bad-teeth#:~:text=%C3%96tzi%20(inset%20photo)%2C%20a,for%20gripping%20tools%20and%20cutting" rel="nofollow">https://www.science.org/content/article/scienceshot-iceman-h...</a>.<p>[2] <a href="https://books.google.com/books?redir_esc=y&hl=en&id=ebUKAQAAMAAJ&focus=searchwithinvolume&q=Dentist" rel="nofollow">https://books.google.com/books?redir_esc=y&hl=en&id=ebUKAQAA...</a>