King Richard III’s mouth bacteria were virtually identical to ordinary people living in 15th-century northern Europe, showing that wealth and royal status didn’t change oral microbiota. A 2026 analysis of DNA from three of his teeth revealed that despite access to rich foods, his oral bacteria diversity matched common people’s, and the gum disease bacteria he carried had the same dangerous genes found in modern strains today.
Scientists analyzed the dental plaque from King Richard III’s teeth using advanced DNA technology to learn about his oral health and diet. They found that despite being royalty with access to rich foods, his mouth bacteria were surprisingly similar to common people living in northern Europe thousands of years ago. The study shows that even the best-preserved ancient plaque doesn’t always contain enough food DNA to tell us what people ate, but it does reveal a lot about the bacteria that lived in their mouths and caused disease.
Key Statistics
A 2026 research article analyzing dental plaque from King Richard III found that his oral microbiome was indistinguishable from commoners living in northern Europe, despite his royal status and access to expensive foods.
Researchers sequenced nearly 400 million DNA reads from three of King Richard III’s teeth, producing one of the richest ancient oral metagenomes ever published, yet found no authenticated dietary DNA despite exceptional preservation.
The Tannerella bacteria found in King Richard III’s 15th-century dental calculus contained the same virulence factors (disease-causing genes) present in modern oral Tannerella species today, suggesting gum disease bacteria have remained essentially unchanged for 500 years.
A comparison of King Richard III’s oral bacteria to samples spanning 7,000 years of northern European populations showed his microbiome diversity fell within the normal range, indicating that geography and time period shape oral bacteria more than social class.
The Quick Take
- What they studied: Whether a king’s royal lifestyle and fancy diet changed the types of bacteria living in his mouth compared to regular people from the same time period.
- Who participated: Three teeth from King Richard III (who lived 1452-1485) were compared to dental plaque samples from thousands of other people who lived across northern Europe over the past 7,000 years.
- Key finding: King Richard III’s mouth bacteria were basically the same as ordinary people’s, even though he was royalty with access to expensive foods. His dental plaque contained one of the richest collections of ancient DNA ever found, but it didn’t show much difference from commoners.
- What it means for you: This research shows that your mouth bacteria are shaped more by time and location than by how rich or poor you are. It also suggests that looking at ancient plaque might not be the best way to figure out what people ate in the past, even when the plaque is in excellent condition.
The Research Details
Scientists extracted DNA from three of King Richard III’s teeth and used powerful sequencing machines to read nearly 400 million pieces of genetic code. They then compared his oral bacteria to samples from thousands of other people living in England, Ireland, the Netherlands, and Germany, some from as far back as the Neolithic period (over 7,000 years ago) and some from modern times.
The researchers used a technique called metagenomics, which is like taking a snapshot of all the bacteria living in one place at one time. They identified which bacteria species were present, how many of each type there were, and looked for genes that make bacteria dangerous or cause disease. They also searched for DNA from plants and animals that King Richard III might have eaten, which would have stuck to his teeth in the plaque.
This approach is important because dental plaque is like a time capsule, it preserves DNA for hundreds or thousands of years. By studying ancient plaque, scientists can learn about diseases, infections, and even diets from people who lived long ago without needing written records. King Richard III is a perfect subject because he’s a famous historical figure, his remains were recently discovered, and his teeth were in unusually good condition.
The study’s strength comes from the exceptionally high-quality DNA recovered from the king’s teeth, nearly 400 million reads is one of the richest ancient oral samples ever analyzed. The researchers compared the results to a large database of other ancient and modern samples, which makes the comparison reliable. However, the study only examined three teeth from one person, so the findings about his individual diet cannot be generalized. The fact that no dietary DNA could be authenticated is also a limitation: it means we can’t actually confirm what the king ate based on this plaque.
What the Results Show
When scientists looked at the types and amounts of bacteria in King Richard III’s mouth, they found that his oral microbiome was completely normal for a person living in northern Europe during the 15th century. The diversity of bacteria species, meaning how many different types were present, fell right in the middle of the range seen in other people from that region and time period. This was surprising because the king had access to expensive, rich foods and lived a royal lifestyle, which researchers thought might have changed his mouth bacteria.
The researchers discovered that King Richard III’s teeth contained many bacteria from the genus Tannerella, which are known to cause gum disease and tooth problems. These ancient bacteria had many of the same dangerous genes (called virulence factors) that modern Tannerella bacteria have today. This suggests that the bacteria causing gum disease haven’t changed much over 500 years.
The study found that despite having some of the best-preserved ancient dental plaque ever studied, there was almost no plant or animal DNA that could be confirmed as coming from food. This is important because it suggests that dental calculus (the hardened plaque on teeth) might not be a reliable way to figure out what people ate in the past, even when the plaque is in perfect condition. The researchers had hoped to learn about King Richard III’s diet by finding traces of food DNA, but this approach didn’t work well enough to draw conclusions.
According to Gram Research analysis, this finding fits with what scientists have learned from studying other ancient populations. Previous research has shown that oral bacteria are more influenced by geography and time period than by social status or wealth. The study adds to growing evidence that the bacteria living in human mouths have remained relatively stable over thousands of years, suggesting that oral disease has been a constant challenge for humans regardless of their social position.
The biggest limitation is that this study only looked at three teeth from one person. While King Richard III is historically important, his individual results might not represent all royalty or all people from his time. The study also couldn’t recover enough food DNA to tell us what the king ate, which was one of the original goals. Additionally, the comparison samples came from different time periods and locations, which makes it harder to isolate the effect of being royal versus other factors. Finally, the study doesn’t explain why a royal diet didn’t change the oral microbiome, it only shows that it apparently didn’t.
The Bottom Line
This research doesn’t provide direct health recommendations for modern people, but it does suggest that maintaining good oral hygiene is important for everyone, regardless of wealth or diet. The bacteria that cause gum disease have remained essentially unchanged for at least 500 years, which means the same prevention strategies (brushing, flossing, and regular dental checkups) that work today would have been beneficial in medieval times. Confidence level: High, based on consistent findings across 7,000 years of human populations.
Historians and archaeologists should care about this research because it shows how ancient DNA can reveal information about past populations. Dentists and oral health professionals may find it interesting that gum disease bacteria haven’t evolved significantly. General readers might appreciate learning that being rich doesn’t protect you from the same mouth bacteria that affect everyone else. This research is not meant to change anyone’s current health practices.
This is historical research, not a study about modern interventions, so there’s no timeline for seeing personal health benefits. However, the findings suggest that oral health challenges have been consistent across human history, meaning good dental care has always been important and always will be.
Frequently Asked Questions
Did King Richard III have different mouth bacteria because he was rich and ate fancy food?
No. Researchers found his oral bacteria were identical to ordinary people from his time and region. His royal diet and wealth didn’t change the types or amounts of bacteria living in his mouth, suggesting that oral microbiota are shaped more by location and time period than by social status.
What can we learn about medieval diet from ancient dental plaque?
Very little, according to this 2026 study. Despite having exceptionally well-preserved plaque from King Richard III, researchers found almost no authenticated plant or animal DNA. This suggests dental calculus may not be reliable for determining what people ate, even under ideal preservation conditions.
Has gum disease bacteria changed over time?
Apparently not much. The Tannerella bacteria causing gum disease in King Richard III’s mouth 500 years ago contained the same dangerous genes found in modern gum disease bacteria today, suggesting these pathogens have remained relatively stable across centuries.
Why is studying a king’s teeth important for understanding history?
Ancient dental plaque preserves DNA for thousands of years, acting like a time capsule. By analyzing it, scientists can learn about diseases, infections, and oral health in past populations without relying solely on written records or skeletal remains.
Does this research change how we should care for our teeth today?
Not directly, but it reinforces that gum disease bacteria have challenged humans for at least 500 years. The consistency of these pathogens across history suggests that basic prevention, brushing, flossing, and regular dental checkups, remains timeless and essential.
Want to Apply This Research?
- Track your daily oral hygiene routine by logging brushing (twice daily), flossing (daily), and dental visits (every 6 months). Since the research shows that gum disease bacteria have remained constant for 500+ years, consistent prevention is key.
- Use the app to set reminders for brushing twice daily and flossing once daily. The research suggests that these basic habits are timeless: they were as important for King Richard III as they are for you today.
- Monitor gum health by noting any bleeding during brushing or flossing, and track dental visit results over time. The app can help you maintain consistency in oral care routines, which is the most effective way to prevent the same gum disease bacteria that affected people 500 years ago.
This research is historical and archaeological in nature, not a clinical study on modern health outcomes. The findings about King Richard III’s oral bacteria do not constitute medical advice and should not be used to diagnose, treat, or prevent any disease. If you have concerns about your oral health, gum disease, or dental problems, consult a qualified dentist or healthcare provider. This article is for educational purposes only and is not a substitute for professional medical or dental advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.
