A growing body of research suggests that the effects of periodontitis extend far beyond the mouth. In a large population-based study conducted in Germany, researchers found that even in the early stages of chronic kidney disease, severe periodontal disease is associated with decreased kidney function and increased levels of markers of kidney damage. The findings indicate that oral health may play a broader role in systemic health than previously recognized.
Periodontitis is often viewed as a disease confined to the oral cavity, characterized by bleeding gums, progressive tissue destruction, and ultimately tooth loss. But growing evidence suggests the effects may extend beyond the mouth. The chronic inflammatory burden associated with periodontitis is associated with several systemic diseases, including cardiovascular disease and diabetes, prompting researchers to investigate its potential role in chronic kidney disease (CKD). Previous studies have reported an association between periodontitis and advanced CKD, but it is not yet clear whether this relationship already exists in the early stages of renal dysfunction.
To address this question, researchers at the University Medical Center Hamburg-Eppendorf, led by Dr. Christian Schmidt-Lauber and Professor Ghazal Alabi, conducted a large population-based study examining the relationship between periodontal disease and early markers of kidney damage. Dr. Schmidt-Lauber explains the motivation behind the study:We aimed to evaluate the relationship between periodontitis and markers of early renal dysfunction, such as decreased renal function and albuminuria, and to explore the potential mediating role of systemic inflammatory markers.” The results of this study were published in Volume 18. International Journal of Oral Sciences above April 6, 2026.
The study included 6,179 participants from the Hamburg City Health Study, a German population-based cohort. All participants underwent a detailed periodontal examination and disease severity was classified according to the 2017 American Academy of Periodontology/European Federation of Periodontology (AAP/EFP) staging system. Kidney health was assessed using estimated glomerular filtration rate (eGFR) and urinary albumin-to-creatinine ratio (uACR), while circulating levels of high-sensitivity C-reactive protein (hsCRP) and interleukin-6 (IL-6) were measured to assess the contribution of systemic inflammation.
This analysis revealed a consistent association between poor periodontal health and worsening kidney function. The prevalence of severe periodontitis increased from 14% in those with normal renal function to 36% in those with moderately compromised renal function. A similar pattern was observed with albuminuria, with more advanced periodontal disease becoming increasingly common as urinary albumin concentrations increased. Measures of cumulative periodontal damage, including clinical attachment loss and tooth loss, also worsened with each stage of renal insufficiency.
Remarkably, these associations persisted even after adjusting for key confounders such as age, sex, diabetes, and smoking status. Severe periodontitis was still independently associated with lower eGFR and higher uACR, and increased clinical attachment loss was associated with both decreased renal function and increased albuminuria. These findings suggest that the observed relationships are not simply the result of common risk factors.
Systemic inflammation appears to contribute to this association, but only partially. With worsening periodontal disease and worsening kidney health, hsCRP and IL-6 levels increased. However, mediation analysis showed that hsCRP accounted for approximately 35% of the association between severe periodontitis and decreased eGFR, whereas the association with albuminuria was only approximately 10%. These results suggest that additional biological mechanisms may be involved, including microbial dissemination from the periodontal tissue, endothelial dysfunction, oxidative stress, and metabolic changes.
Because CKD often progresses asymptomatically until significant kidney damage occurs, identifying early indicators of risk remains a major clinical challenge. ”This study highlights that oral health is a potential window into kidney health by demonstrating an association between periodontitis and markers of early renal dysfunction.“, said Dr. Aarabi. The results may inform future screening approaches and provide a rationale for intervention studies investigating whether periodontal treatment helps preserve kidney function. This study’s large sample size, standardized periodontal assessment, and comprehensive assessment of renal biomarkers further strengthen the reliability of the results.
In conclusion, this study provides strong evidence that periodontitis is independently associated with decreased renal function and increased albuminuria, even in the early stages of CKD. Although systemic inflammation appears to partially explain this relationship, many of the associations may involve additional biological pathways. These findings support the growing recognition that oral and renal health are closely linked and highlight the importance of considering periodontal disease within the broader context of systemic health.
sauce:
Hamburg-Eppendorf University Medical Center (UK)
Reference magazines:
Schmidt-Lauber, C. Others. (2026) Association between decreased renal function and periodontitis with albuminuria in early chronic kidney disease: a population-based study. International Journal of Oral Sciences. DOI: 10.1038/s41368-026-00435-6. https://www.nature.com/articles/s41368-026-00435-6
