Middle East Research Journal of Dentistry | Volume: 6 | Issue-01 | Pages: 16-18
Oral Manifestations and Implications of Metabolic Syndrome: An Overview for Dental Clinicians
Maheswaran T, Gowri S, Sivaguru K, Pamalai G, Harshini G, Saranya M
Published : Feb. 10, 2026
DOI : https://doi.org/10.36348/merjd.2026.v06i01.005
Abstract
Metabolic syndrome represents a cluster of interconnected conditions, including central obesity, insulin resistance, dyslipidemia, and hypertension, which collectively increase the risk of cardiovascular disease. Emerging evidence demonstrates a significant bidirectional association between metabolic syndrome and various oral health conditions. This review synthesizes the current knowledge regarding the oral manifestations of metabolic syndrome, with particular emphasis on periodontitis, dental caries, tooth loss, salivary dysfunction, and oral microbiome alterations. Recognition of these oral-systemic connections enables dental clinicians to contribute meaningfully to the early detection and comprehensive management of metabolic syndrome through routine oral health assessments.

INTRODUCTION

Metabolic syndrome affects approximately one-quarter of the global adult population and represents a major public health challenge with a rising prevalence worldwide [1]. This constellation of metabolic abnormalities significantly elevates the risk of type 2 diabetes mellitus and cardiovascular complications [2]. Recent investigations have revealed compelling associations between metabolic syndrome and various oral conditions, suggesting that the oral cavity may serve as both an indicator and potential modulator of systemic metabolic health [3]. Understanding these oral-systemic relationships equips dental practitioners with the knowledge to recognize early warning signs and facilitate timely medical referrals for comprehensive patient care [4]. Therefore, this review provides a concise summary of the oral manifestations and implications of metabolic syndrome for dental clinicians.

 

Periodontal Disease and Metabolic Syndrome

Periodontitis has the most extensively documented association with metabolic syndrome among oral conditions [5]. Meta-analytic evidence reveals that individuals with metabolic syndrome exhibit significantly elevated odds of periodontitis, with reported odds ratios ranging from 1.38 to 2.09, depending on the diagnostic criteria employed [2]. This relationship appears bidirectional, as periodontal inflammation may exacerbate insulin resistance and contribute to metabolic dysregulation through systemic inflammatory pathways [3]. Longitudinal studies have demonstrated that individuals with deep periodontal pockets have a substantially increased risk of developing metabolic syndrome components, particularly abdominal obesity and dysglycemia [6]. Among the components of metabolic syndrome, dysglycemia and obesity demonstrate the strongest individual associations with periodontal disease severity [7]. Furthermore, patients with both periodontitis and metabolic syndrome face markedly elevated risks of all-cause and cardiovascular mortality compared to those with metabolic syndrome alone [8]. The inflammatory burden imposed by untreated periodontitis appears to amplify cardiovascular risk factors by elevating systemic inflammatory mediators, including C-reactive protein, interleukin-6, and tumor necrosis factor-alpha [4].

 

 

Dental Caries and Tooth Loss

The relationship between dental caries and metabolic syndrome has garnered increasing research attention, although the evidence remains less robust than that for periodontal disease [9]. Cross-sectional investigations in diverse populations have revealed positive associations between caries experience and metabolic syndrome. Individuals with severe dental caries demonstrate a higher prevalence of metabolic syndrome components, particularly abdominal obesity, elevated blood pressure, and hyperglycemia [10]. The presence of untreated decayed teeth is independently associated with metabolic syndrome, even after controlling for periodontal status, tooth loss, and health behaviors [11]. Dietary factors represent a potential mechanistic link, as high sugar consumption contributes to both cariogenic oral environments and metabolic dysfunction [12].

 

Tooth loss, representing the endpoint of periodontal disease and dental caries, is significantly associated with metabolic syndrome. Population-based studies indicate that individuals with metabolic syndrome experience accelerated tooth loss over time, with approximately 10.8% losing at least one tooth over five years [13]. The number of remaining teeth shows an inverse correlation with metabolic syndrome risk, suggesting a dose-response relationship [14]. Tooth loss adversely affects masticatory function, potentially leading to dietary modifications that further compromise metabolic health through reduced nutrient quality and altered food selection patterns [4]. Recent metabolomic profiling has revealed that missing teeth are associated with unfavorable lipid profiles, including elevated triglyceride levels, reduced high-density lipoprotein cholesterol levels, and altered fatty acid composition [15].

 

Oral Hygiene Behaviors and Preventive Implications

Oral hygiene practices are associated with the development of metabolic syndrome [16]. Systematic review evidence indicates that frequent tooth brushing correlates with reduced prevalence of metabolic syndrome, with individuals brushing three or more times daily showing approximately 53% lower odds than those brushing once daily or less [17]. Regular interdental cleaning is similarly associated with a decreased risk of metabolic syndrome [16]. These findings suggest that maintaining good oral hygiene may help modulate the systemic inflammatory burden and potentially influence metabolic health trajectories [17]. Childhood oral infections show longitudinal associations with adult metabolic syndrome, underscoring the importance of early preventive intervention [18].

 

Oral Microbiome and Salivary Changes

The oral microbiome undergoes compositional shifts in patients with metabolic syndrome, with an increased abundance of pro-inflammatory bacterial genera, including Actinomyces, Corynebacterium, and Fusobacterium, in subgingival plaque [19]. Salivary microbiome analysis revealed distinct bacterial profiles in patients with metabolic syndrome compared to healthy controls, suggesting potential diagnostic utility [3]. These microbial alterations may contribute to systemic inflammation through the translocation of oral bacteria and their metabolic products into the bloodstream, particularly in the presence of a compromised periodontal barrier function [19]. Prolonged dietary interventions in patients with metabolic syndrome have beneficial effects on oral microbiome composition, alongside improvements in periodontal inflammatory parameters [20].

 

CONCLUSION

Metabolic syndrome has multiple oral health implications, most prominently periodontitis, with additional associations involving dental caries, accelerated tooth loss, and oral microbiome dysbiosis. Dental clinicians occupy a strategic position to identify the risk of metabolic syndrome through comprehensive oral examinations and facilitate interdisciplinary care. Enhanced awareness of these oral-systemic relationships enables earlier detection and potentially improves long-term metabolic and cardiovascular outcomes through integrated preventive strategies that include oral health.

 

REFERENCES

  1. Moradpour F, Karimi Z, Fatemi Z, Moradi Y, Khosravi MR, Shokri A, Karimzadeh M. Prevalence of metabolic syndrome and its association with oral health: First results from the Kurdish cohort study. Health Sci Rep. 2023 Oct 12;6(10):e1602. doi: 10.1002/hsr2.1602. PMID: 37841941; PMCID: PMC10568541.
  2. Nibali L, Tatarakis N, Needleman I, Tu YK, D'Aiuto F, Rizzo M, Donos N. Clinical review: Association between metabolic syndrome and periodontitis: a systematic review and meta-analysis. J Clin Endocrinol Metab. 2013 Mar;98(3):913-20. doi: 10.1210/jc.2012-3552. Epub 2013 Feb 5. PMID: 23386648.
  3. Pirih FQ, Monajemzadeh S, Singh N, Sinacola RS, Shin JM, Chen T, Fenno JC, Kamarajan P, Rickard AH, Travan S, Paster BJ, Kapila Y. Association between metabolic syndrome and periodontitis: The role of lipids, inflammatory cytokines, altered host response, and the microbiome. Periodontol 2000. 2021 Oct;87(1):50-75. doi: 10.1111/prd.12379. PMID: 34463996; PMCID: PMC8457155.
  4. Lamster IB, Pagan M. Periodontal disease and the metabolic syndrome. Int Dent J. 2017 Apr;67(2):67-77. English. doi: 10.1111/idj.12264. Epub 2016 Nov 9. PMID: 27861820; PMCID: PMC9376683.
  5. Gobin R, Tian D, Liu Q, Wang J. Periodontal Diseases and the Risk of Metabolic Syndrome: An Updated Systematic Review and Meta-Analysis. Front Endocrinol (Lausanne). 2020 Jun 9;11:336. doi: 10.3389/fendo.2020.00336. PMID: 32582028; PMCID: PMC7296056.
  6. Saito M, Shimazaki Y, Yoshii S, Takeyama H. Periodontitis and the incidence of metabolic syndrome: An 8-year longitudinal study of an adult Japanese cohort. J Clin Periodontol. 2024 Jan;51(1):54-62. doi: 10.1111/jcpe.13881. Epub 2023 Sep 24. PMID: 37743671.
  7. Campos JR, Martins CC, Faria SFS, Carvalho AP, Pereira AG, Costa FO, Cota LOM. Association between components of metabolic syndrome and periodontitis: a systematic review and meta-analysis. Clin Oral Investig. 2022 Sep;26(9):5557-5574. doi: 10.1007/s00784-022-04583-x. Epub 2022 Jun 18. PMID: 35716205.
  8. Li T, Wu H, Fu Z, Li H, Li Q, Liu Y, Zhang Q. The Association Between Periodontitis and the Prevalence and Prognosis of Metabolic Syndrome. J Multidiscip Healthc. 2025 Feb 21;18:1053-1065. doi: 10.2147/JMDH.S499516. PMID: 40008287; PMCID: PMC11853064.
  9. Adachi N, Kobayashi Y. One-year follow-up study on associations between dental caries, periodontitis, and metabolic syndrome. J Oral Sci. 2020;62(1):52-56. doi: 10.2334/josnusd.18-0251. PMID: 31996523.
  10. Cao X, Wang D, Zhou J, Yuan H, Chen Z. Relationship between dental caries and metabolic syndrome among 13 998 middle-aged urban Chinese. J Diabetes. 2017 Apr;9(4):378-385. doi: 10.1111/1753-0407.12424. Epub 2016 Jul 18. PMID: 27147550.
  11. Ojima M, Amano A, Kurata S. Relationship between decayed teeth and metabolic syndrome: data from 4716 middle-aged male Japanese employees. J Epidemiol. 2015;25(3):204-11. doi: 10.2188/jea.JE20140132. Epub 2015 Jan 10. PMID: 25716056; PMCID: PMC4340997.
  12. Ojima M, Amano A, Kurata S. Relationship between decayed teeth and metabolic syndrome: data from 4716 middle-aged male Japanese employees. J Epidemiol. 2015;25(3):204-11. doi: 10.2188/jea.JE20140132. Epub 2015 Jan 10. PMID: 25716056; PMCID: PMC4340997.
  13. Furuta M, Liu A, Shinagawa T, Takeuchi K, Takeshita T, Shimazaki Y, Yamashita Y. Tooth loss and metabolic syndrome in middle-aged Japanese adults. J Clin Periodontol. 2016 Jun;43(6):482-91. doi: 10.1111/jcpe.12523. Epub 2016 May 5. PMID: 26847391.
  14. Shin HS. The Number of Teeth Is Inversely Associated With Metabolic Syndrome: A Korean Nationwide Population-Based Study. J Periodontol. 2017 Sep;88(9):830-838. doi: 10.1902/jop.2017.170089. Epub 2017 Apr 28. PMID: 28452621.
  15. Halme AM, Salminen A, Suominen AL, Havulinna A, Mäntylä P, Buhlin K, Paju S, Männistö S, Salomaa V, Sattler W, Sinisalo J, Pussinen PJ. Metabolic Profiling of Individuals with Missing Teeth and Tooth Loss. J Dent Res. 2025 Apr;104(4):389-397. doi: 10.1177/00220345241298219. Epub 2025 Jan 3. PMID: 39754308; PMCID: PMC11909773.
  16. Santoso CMA, Ketti F, Bramantoro T, Zsuga J, Nagy A. Association between Oral Hygiene and Metabolic Syndrome: A Systematic Review and Meta-Analysis. J Clin Med. 2021 Jun 28;10(13):2873. doi: 10.3390/jcm10132873. PMID: 34203460; PMCID: PMC8269064.
  17. Kobayashi Y, Niu K, Guan L, Momma H, Guo H, Cui Y, Nagatomi R. Oral health behavior and metabolic syndrome and its components in adults. J Dent Res. 2012 May;91(5):479-84. doi: 10.1177/0022034512440707. Epub 2012 Feb 29. PMID: 22378694.
  18. Pussinen PJ, Paju S, Viikari J, Salminen A, Taittonen L, Laitinen T, Burgner D, Kähönen M, Lehtimäki T, Hutri-Kähönen N, Raitakari O, Juonala M. Childhood Oral Infections Associate with Adulthood Metabolic Syndrome: A Longitudinal Cohort Study. J Dent Res. 2020 Sep;99(10):1165-1173. doi: 10.1177/0022034520929271. Epub 2020 Jun 1. PMID: 32479136; PMCID: PMC7443963.
  19. Prince Y, Davison GM, Davids SFG, Erasmus RT, Kengne AP, Graham LM, Raghubeer S, Matsha TE. The Relationship between the Oral Microbiota and Metabolic Syndrome. Biomedicines. 2022 Dec 20;11(1):3. doi: 10.3390/biomedicines11010003. PMID: 36672511; PMCID: PMC9855685.
  20. Pappe CL, Kleine Bardenhorst S, Prior K, Steckhan N, Michalsen A, Ehmke B, Dommisch H, Hagenfeld D. Impact of Prolonged Fasting on the Oral Microbiome in Patients with Metabolic Syndrome: An Exploratory Secondary Analysis. J Clin Periodontol. 2025 Aug;52(8):1125-1135. doi: 10.1111/jcpe.14171. Epub 2025 May 12. PMID: 40356261; PMCID: PMC12259404.

 

 



This work is licensed under a Creative Commons
Attribution-NonCommercial 4.0 International License.
© Copyright Kuwait Scholars Publisher. All Rights Reserved.