I want to talk about a pandemic, but not the one you might be thinking of.
A recent study proposes that the Second Plague—commonly called the Black Death in the 14th century, which devastated populations across Europe and beyond—may have shaped oral microbiomes in ways that still affect chronic disease risk today.
Put simply: changes that began centuries ago could be part of the reason many people now struggle with unhealthy oral microbiomes. You might blame your parents for your habits, but it turns out your 14th-century ancestors may have played a role too.
The researchers behind the study point to shifts in the Streptococcus group within modern oral microbiomes. Those strains are linked to diets lower in fiber and higher in carbohydrates and dairy—dietary patterns that became more common among some survivors after the plague when access to processed and richer foods changed.
Why should someone living in the 21st century care?
- We can’t change our family history, but understanding how past events influenced oral microbial communities helps us make better choices for our own oral health today.
- Oral microbiome testing is useful because it gives you a baseline. Knowing your current oral ecosystem lets you target improvements effectively. This is the oral microbiome test I use with patients and at home.
- Can the shifts caused by historical pandemics and hygiene changes be reversed or mitigated? Yes—there are practical steps individuals can take to restore a healthier oral microbiome.
- Even if broad historical trends altered population-level microbiomes, you as an individual retain substantial control. My online course on resetting your oral microbiome shows strategies that can make a real difference for people who’ve struggled with oral health.
Latest from the Ask the Dentist podcast:
🎧 In Episode #112, I cover “How to Prevent and Treat Gingival Recession.” This episode is a must-listen if you want practical guidance on preventing and managing gum recession—one of the most common concerns I’m asked about.
Thanks for reading this week’s edition of Mondays with Mark. Would you do me a favor? Please leave a review for the podcast on Apple, Spotify, or wherever you listen. I read every review, and hearing how the show helps you makes my day.
P.S. Our professional-strength hydroxyapatite varnish is available for at-home use. It can be applied like a toothpaste, used as a targeted spot treatment, or worn in trays overnight. People use it for whitening, sensitivity relief, and for preventing—and in some cases helping to reverse—early cavities.