In the past several years, there has been increasing appreciation for the interconnectedness of oral health and whole body wellness, highlighted by the US Surgeon General's report in 20001. Many subsequent efforts have established a connection between oral diseases, especially periodontitis, and impacts on a variety of systemic diseases.1 The goal of this report is to review evidence on the efficacy of dental care/treatment in improving outcomes for patients with Diabetes.
Diabetes mellitus (DM) characterized by high blood sugar levels (HbA1c > 6.5%) affects approximately 37 million adults in the United States2 and 500 million globally.3,4 Diabetes is a chronic metabolic disease that occurs either when the pancreas does not produce enough insulin or when the body cannot effectively use the insulin it produces. It is also termed as the "silent epidemic" causing a range of other diseases and health complications, including lower limb amputations, blindness, chronic kidney disease, and cardiovascular diseases5. Type II diabetes mellitus is a highly prevalent metabolic disorder characterized by the loss of ability to adequately control blood glucose levels due to insulin resistance in body tissues and typically emerges in adulthood. This is in contrast to type I diabetes mellitus (formerly commonly known as juvenile diabetes), where an autoimmune response results in the destruction of insulin-secreting β cells in the pancreas, requiring life-long insulin therapy.6 Combined, these diseases affect ~10% of adults with 90% of the cases being type II diabetes, resulting in a substantial global disease burden.2
Diabetes was the eighth leading cause of death in the United States in 2021 when considering death certificates that listed diabetes as a direct cause, however the mortality rate tripled when considering diabetes as an underlying or contributing cause.2,7 Indeed, it is this spectrum of comorbidities that constitute the majority of the health burden of diabetes and factors that exacerbate the hyperglycemic damage to the vasculature are critical intervention loci in the management of diabetes.3 These inflammatory exacerbating factors are now thought to include atherosclerosis, obesity, hypertension, changes in the gut microbiota, and others.8 A key question in this review is whether oral inflammatory disease may contribute to or exacerbate the pathology of diabetes mellitus, and to collect evidence on dental treatments influencing diabetes outcomes.
Chronic oral diseases (COD) are a range of conditions that affect the mouth, including dental caries, gingival infection, periodontal disease, and tooth loss.4 They are among the most common chronic diseases in the United States and can have a significant impact on overall health. COD are significantly more common and more severe in diabetic patients,5 with particular associations having been identified between diabetes and gingivitis and periodontitis. In addition, there may be increased risk in diabetes patients of systemic opportunistic infections after dental procedures such as implants to replace lost teeth.6 High glucose levels in saliva from uncontrolled diabetes can feed bacteria in the mouth, which can create plaque that causes tooth decay, and even tooth loss. Dry mouth, also known as xerostomia, can be caused by high blood sugar levels in people with diabetes. Dry mouth can also increase the risk of tooth decay. Patients with diabetes are three times as likely to have oral candidiasis relative to healthy subjects7. Periodontitis is estimated to impact up to 90% of all adults worldwide and encompasses a range of severities ranging from mild gingivitis to severe loss of connective tissue resulting in painful inflammation and tooth loss. The most severe manifestations of periodontal disease are estimated to impact 5-15% of adults globally with perhaps even greater 4 prevalence in the United States.8 One of the key factors in the development of periodontitis is a subdued granulocytic response to bacterial challenge in the oral cavity, resulting in increased plaque formation and eventually gum disease.9 Indeed, one of the major clinical effects of diabetes is immune suppression, especially in polymorphonuclear cells due to alterations in immunometabolism.10
Increasing evidence suggests that COD has a more complex relationship with diabetes than was previously appreciated, with the two being locked into a feedback loop where increasing COD severity results in greater systemic inflammation, which reduces glycemic control3. People with diabetes have a 2–3-fold greater risk for periodontitis11 compared to people without diabetes, but also a higher incidence of caries due to dry mouth. The progression and severity of periodontitis are also greater in people with poorly controlled diabetes. According to the American Academy of Periodontology, 50% of diabetics up to the age of 35 suffer from periodontal disease, a figure that rises to 80% at the age of 45–54 years, compared to 60% in the healthy population. A growing body of data indicates that oral inflammation has an impact on general diseases.12 This results in diabetes patients with severe COD having a significantly increased risk of all-cause mortality, highlighting the impact of oral health on cardiovascular, immune, and renal function. Figure 1 is a proposed causal model representing the factors that demonstrate an interplay between diabetes and oral disease. The relationship between oral health treatment and diabetes management has long been investigated in several studies but the exact correlation between oral health management and diabetes has not been comprehensively addressed.
- U.S. Department of Health and Human Services. Oral Health in America: A Report of the Surgeon General. Rockville, MD: U.S. Department of Health and Human Services, National Institute of Dental and Craniofacial Research, National Institutes of Health, 2000.; 2000.
- Cho, N. H.; Shaw, J. E.; Karuranga, S.; Huang, Y.; Da Rocha Fernandes, J. D.; Ohlrogge, A. W.; Malanda, B. IDF Diabetes Atlas: Global Estimates of Diabetes Prevalence for 2017 and Projections for 2045. Diabetes Research and Clinical Practice 2018, 138, 271–281. https://doi.org/10.1016/j.diabres.2018.02.023.
- Tsalamandris, S.; Antonopoulos, A. S.; Oikonomou, E.; Papamikroulis, G.-A.; Vogiatzi, G.; Papaioannou, S.; Deftereos, S.; Tousoulis, D. The Role of Inflammation in Diabetes: Current Concepts and Future Perspectives. Eur Cardiol 2019, 14 (1), 50–59. https://doi.org/10.15420/ecr.2018.33.1.
- Heydari, M.-H.; Sharifi, F.; Sobhaninejad, S.; Sharifi, A.; Alizadeh, L.; Darmiani, S.; Bijari, S.; Parvaie, P.; Bakhshandeh, S.; Shoaee, S.; Khoshnevisan, M.-H. The Association between Dental Caries, Periodontal Diseases, and Tooth Loss with Diabetes Mellitus among the Elderly Population. J Diabetes Metab Disord 2024, 23 (1), 1371–1380. https://doi.org/10.1007/s40200-024-01434-2.
- Triebl, Z.; Bencze, B.; Bányai, D.; Rózsa, N.; Hermann, P.; Végh, D. Poor Glycemic Control Impairs Oral Health in Children with Type 1 Diabetes Mellitus - a Systematic Review and Meta-Analysis. BMC Oral Health 2024, 24 (1), 748. https://doi.org/10.1186/s12903-024-04516-y.
- Al Ansari, Y.; Shahwan, H.; Chrcanovic, B. R. Diabetes Mellitus and Dental Implants: A Systematic Review and Meta-Analysis. Materials (Basel) 2022, 15 (9), 3227. https://doi.org/10.3390/ma15093227.
- Rodríguez-Archilla, A.; Piedra-Rosales, C. Candida Species Oral Detection and Infection in Patients with Diabetes Mellitus: A Meta-Analysis. 2021. https://doi.org/10.5281/ZENODO.4495286.
- Germen, M.; Baser, U.; Lacin, C. C.; Fıratlı, E.; İşsever, H.; Yalcin, F. Periodontitis Prevalence, Severity, and Risk Factors: A Comparison of the AAP/CDC Case Definition and the EFP/AAP Classification. Int J Environ Res Public Health 2021, 18 (7), 3459. https://doi.org/10.3390/ijerph18073459.
- Uriarte, S. M.; Hajishengallis, G. Neutrophils in the Periodontium: Interactions with Pathogens and Roles in Tissue Homeostasis and Inflammation. Immunol Rev 2023, 314 (1), 93–110. https://doi.org/10.1111/imr.13152.
- Dowey, R.; Iqbal, A.; Heller, S. R.; Sabroe, I.; Prince, L. R. A Bittersweet Response to Infection in Diabetes; Targeting Neutrophils to Modify Inflammation and Improve Host Immunity. Front. Immunol. 2021, 12, 678771. https://doi.org/10.3389/fimmu.2021.678771.
- Löe, H. Periodontal Disease: The Sixth Complication of Diabetes Mellitus. Diabetes Care 1993, 16 (1), 329–334. https://doi.org/10.2337/diacare.16.1.329.
- National Institutes of Health. Oral Health Care in America: Advances and Challenges. Bethesda, MD: US Department of Health and Human Services, National Institutes of Health, National Institute of Dental and Craniofacial Research.; 2021.
- Sterne, J. A. C.; Savović, J.; Page, M. J.; Elbers, R. G.; Blencowe, N. S.; Boutron, I.; Cates, C. J.; Cheng, H.-Y.; Corbett, M. S.; Eldridge, S. M.; Emberson, J. R.; Hernán, M. A.; Hopewell, S.; Hróbjartsson, A.; Junqueira, D. R.; Jüni, P.; Kirkham, J. J.; Lasserson, T.; Li, T.; McAleenan, A.; Reeves, B. C.; Shepperd, S.; Shrier, I.; Stewart, L. A.; Tilling, K.; White, I. R.; Whiting, P. F.; Higgins, J. P. T. RoB 2: A Revised Tool for Assessing Risk of Bias in Randomised Trials. BMJ 2019, l4898. https://doi.org/10.1136/bmj.l4898.
- Sterne, J. A.; Hernán, M. A.; Reeves, B. C.; Savović, J.; Berkman, N. D.; Viswanathan, M.; Henry, D.; Altman, D. G.; Ansari, M. T.; Boutron, I.; Carpenter, J. R.; Chan, A.-W.; Churchill, R.; Deeks, J. J.; Hróbjartsson, A.; Kirkham, J.; Jüni, P.; Loke, Y. K.; Pigott, T. D.; Ramsay, C. R.; Regidor, D.; Rothstein, H. R.; Sandhu, L.; Santaguida, P. L.; Schünemann, H. J.; Shea, B.; Shrier, I.; Tugwell, P.; Turner, L.; Valentine, J. C.; Waddington, H.; Waters, E.; Wells, G. A.; Whiting, P. F.; Higgins, J. P. ROBINS-I: A Tool for Assessing Risk of Bias in Non-Randomised Studies of Interventions. BMJ 2016, i4919. https://doi.org/10.1136/bmj.i4919.
- Wells, G.; Shea, B.; O’Connell, J.; Robertson, J.; Peterson, V.; Welch, V. The NewcastleOttawa Scale (NOS) for Assessing the Quality of Nonrandomised Studies in Meta-Analysis.
- Shea, B. J.; Reeves, B. C.; Wells, G.; Thuku, M.; Hamel, C.; Moran, J.; Moher, D.; Tugwell, P.; Welch, V.; Kristjansson, E.; Henry, D. A. AMSTAR 2: A Critical Appraisal Tool for Systematic Reviews That Include Randomised or Non-Randomised Studies of Healthcare Interventions, or Both. BMJ 2017, j4008. https://doi.org/10.1136/bmj.j4008.
- Centers for Disease Control and Prevention. Diabetes. https://www.cdc.gov/diabetes/index.html (accessed 2024-07-19).
- American Diabetes Association Professional Practice Committee; ElSayed, N. A.; Aleppo, G.; Bannuru, R. R.; Beverly, E. A.; Bruemmer, D.; Collins, B. S.; Cusi, K.; Darville, A.; Das, S. R.; Ekhlaspour, L.; Fleming, T. K.; Gaglia, J. L.; Galindo, R. J.; Gibbons, C. H.; Giurini, J. M.; Hassanein, M.; Hilliard, M. E.; Johnson, E. L.; Khunti, K.; Kosiborod, M. N.; Kushner, R. F.; Lingvay, I.; Matfin, G.; McCoy, R. G.; Murdock, L.; Napoli, N.; Perry, M. L.; Pilla, S. J.; Polsky, S.; Prahalad, P.; Pratley, R. E.; Segal, A. R.; Seley, J. J.; Selvin, E.; Silva, P. S.; Stanton, R. C.; Verduzco-Gutierrez, M.; Woodward, C. C.; Younossi, Z. M.; Gabbay, R. A. Introduction and Methodology: Standards of Care in Diabetes—2024. Diabetes Care 2024, 47 (Supplement_1), S1–S4. https://doi.org/10.2337/dc24-SINT.
- American Dental Association. https://engage.ada.org/.
- Covidence.
- Pedroso, J. de F.; Lotfollahi, Z.; Albattarni, G.; Arrruda Schulz, M.; Monteiro, A.; Sehnem, A. L.; Gidlund, M. A.; Figueiredo Neto, A. M.; Jardini, M. A. N. Influence of Periodontal Disease on Cardiovascular Markers in Diabetes Mellitus Patients. Sci Rep 2019, 9 (1), 16138. https://doi.org/10.1038/s41598-019-52498-7.
- Mizutani, K.; Minami, I.; Mikami, R.; Kido, D.; Takeda, K.; Nakagawa, K.; Takemura, S.; Saito, N.; Kominato, H.; Sakaniwa, E.; Konuma, K.; Izumi, Y.; Ogawa, Y.; Iwata, T. Improvement of Periodontal Parameters Following Intensive Diabetes Care and Supragingival Dental Prophylaxis in Patients with Type 2 Diabetes: A Prospective Cohort Study. Journal of clinical periodontology 2024, 51 (6), 733–741. https://doi.org/10.1111/jcpe.13958.
- Zhang, Y.; Leveille, S. G.; Camhi, S. M.; Shi, L. Association of Oral Care with Periodontitis and Glycemic Control among US Adults with Diabetes. BMC Oral Health 2023, 23 (1), 903. https://doi.org/10.1186/s12903-023-03580-0.
- Enomoto, A.; Lee, A.-D.; Shimoide, T.; Takada, Y.; Kakiuchi, Y.; Tabuchi, T. Is Discontinuation of Dental Treatment Related to Exacerbation of Systemic Medical Diseases in Japan?. British dental journal 2023. https://doi.org/10.1038/s41415-023-5690-3.
- Di Domenico, G. L.; Minoli, M.; Discepoli, N.; Ambrosi, A.; de Sanctis, M. Effectiveness of Periodontal Treatment to Improve Glycemic Control: An Umbrella Review. Acta Diabetol 2023, 60 (1), 101–113. https://doi.org/10.1007/s00592-022-01991-z.
- Ata-Ali, F.; Melo, M.; Cobo, T.; Nagasawa, M. A.; Shibli, J. A.; Ata-Ali, J. Does Non-Surgical Periodontal Treatment Improve Glycemic Control? A Comprehensive Review of Meta-Analyses. Journal of the International Academy of Periodontology 2020, 22 (4), 205–222.
- Lavigne, S. E.; Forrest, J. L. An Umbrella Review of Systematic Reviews Examining the Relationship between Type 2 Diabetes and Periodontitis: Position Paper from the Canadian Dental Hygienists Association. Canadian journal of dental hygiene : CJDH = Journal canadien de l’hygiene dentaire : JCHD 2021, 55 (1), 57–67.
- Wu, S.-Y.; Wu, C.-Y.; Lin, L.-Y.; Chen, Y.-H.; Huang, H.-Y.; Lai, Y.-L.; Lee, S.-Y. Systemic Antibiotics Adjuvants to Scaling and Root Planing in Type 2 Diabetic and Periodontitis Individuals: Systematic Review with Network Meta-Analysis. The Japanese dental science review 2023, 59, 167–178. https://doi.org/10.1016/j.jdsr.2023.06.001.
- Esteves Lima, R. P.; Atanazio, A. R. S.; Costa, F. O.; Cunha, F. A.; Abreu, L. G. IMPACT OF NON-SURGICAL PERIODONTAL TREATMENT ON SERUM TNF-Alpha LEVELS IN INDIVIDUALS WITH TYPE 2 DIABETES: A SYSTEMATIC REVIEW AND META-ANALYSIS. The journal of evidence-based dental practice 2021, 21 (2), 101546. https://doi.org/10.1016/j.jebdp.2021.101546.
- Obadan-Udoh, E.; Jordan, S.; Mudah, O.; Borgnakke, W.; Tavares, M. Gap Analysis of Older Adults With Type 2 Diabetes Receiving Nonsurgical Periodontal Therapy. The journal of evidence-based dental practice 2017, 17 (4), 335–349. https://doi.org/10.1016/j.jebdp.2017.05.005.
- Simpson, T. C.; Clarkson, J. E.; Worthington, H. V.; MacDonald, L.; Weldon, J. C.; Needleman, I.; Iheozor-Ejiofor, Z.; Wild, S. H.; Qureshi, A.; Walker, A.; Patel, V. A.; Boyers, D.; Twigg, J. Treatment of Periodontitis for Glycaemic Control in People with Diabetes Mellitus. Cochrane Database Syst Rev 2022, 4 (4), CD004714. https://doi.org/10.1002/14651858.CD004714.pub4.
- Elnour, M. A. A.; Mirghani, H. O. Periodontitis Treatment (Surgical and Nonsurgical) Effects on Glycemic Control: A Review and Meta-Analysis. Ann Afr Med 2023, 22 (2), 131–135. https://doi.org/10.4103/aam.aam_53_22.
- Greggianin, B. F.; Marques, A. E. M.; Amato, A. A.; de Lima, C. L. Effect of Periodontal Therapy on Insulin Resistance in Adults with Dysglycemia and Periodontitis: A Systematic Review and Meta-Analysis. Clinical oral investigations 2023, 27 (4), 1329–1342. https://doi.org/10.1007/s00784-023-04879-6.
- Pham, T. A. V.; Nguyen, P. A.; Tran, T. T. P.; Nguyen, V. T. T. Nonsurgical Periodontal Treatment Improved the Type 2 Diabetes Mellitus Status in Smokers: A Randomized Controlled Trial. Diabetes research and clinical practice 2022, 194, 110150. https://doi.org/10.1016/j.diabres.2022.110150.
- Kolte, R. A.; Kolte, A. P.; Bawankar, P. V.; Bajaj, V. A. Effect of Nonsurgical Periodontal Therapy on Metabolic Control and Systemic Inflammatory Markers in Patients of Type 2 Diabetes Mellitus with Stage III Periodontitis. Contemporary clinical dentistry 2023, 14 (1), 45–51. https://doi.org/10.4103/ccd.ccd_514_21.
- Wang, Y.; Liu, H. N.; Zhen, Z.; Pelekos, G.; Wu, M. Z.; Chen, Y.; Tonetti, M.; Tse, H. F.; Yiu, K. H.; Jin, L. A Randomized Controlled Trial of the Effects of Non-Surgical Periodontal Therapy on Cardiac Function Assessed by Echocardiography in Type 2 Diabetic Patients. J Clin Periodontol 2020, 47 (6), 726–736. https://doi.org/10.1111/jcpe.13291.
- Sundaram, S. G.; Ramakrishnan, T.; Krishnan, S. G.; Narayan, K. V.; Shankar, S.; Kanimozhi, G. Effect of Non-Surgical Periodontal Therapy on Systemic Inflammatory Markers, Glycemic Status and Levels of Proteinuria in Type 2 Diabetic and Non-Diabetic Patients With Chronic Periodontitis. Cureus 2023, 15 (9), e44757. https://doi.org/10.7759/cureus.44757.
- Mammen, J.; Vadakkekuttical, R. J.; George, J. M.; Kaziyarakath, J. A.; Radhakrishnan, C. Effect of Non-Surgical Periodontal Therapy on Insulin Resistance in Patients with Type II Diabetes Mellitus and Chronic Periodontitis, as Assessed by C-Peptide and the Homeostasis Assessment Index. J Investig Clin Dent 2017, 8 (3). https://doi.org/10.1111/jicd.12221.
- Bagde, H.; Sharma, A. K.; Chaubey, P. P.; Benjamin, N.; Ghosh, D.; Kaushal, L. Effect of Scaling and Root Planing in Conjunction with Antimicrobial Therapy on Glycated Hemoglobin Levels in Type 2 Diabetes Mellitus Patients. Journal of pharmacy & bioallied sciences 2023, 15 (Suppl 2), S956–S959. https://doi.org/10.4103/jpbs.jpbs_268_23.
- Sato, M.; Ono, S.; Yamana, H.; Okada, A.; Ishimaru, M.; Ono, Y.; Iwasaki, M.; Aida, J.; Yasunaga, H. Effect of Periodontal Therapy on Glycaemic Control in Type 2 Diabetes. Journal of clinical periodontology 2024, 51 (4), 380–389. https://doi.org/10.1111/jcpe.13939.
- Peng, C.-H.; Yang, Y.-S.; Chan, K.-C.; Kornelius, E.; Chiou, J.-Y.; Huang, C.-N. Periodontal Treatment and the Risks of Cardiovascular Disease in Patients with Type 2 Diabetes: A Retrospective Cohort Study. Intern Med 2017, 56 (9), 1015–1021. https://doi.org/10.2169/internalmedicine.56.7322.
- Michalowicz, B. S.; Anderson, J. P.; Kottke, T. E.; Dehmer, S. P.; Worley, D. C.; Kane, S.; Basile, S.; Rindal, D. B. Periodontal Treatment and Subsequent Clinical Outcomes and Medical Care Costs: A Retrospective Cohort Study. PloS one 2023, 18 (8), e0290028. https://doi.org/10.1371/journal.pone.0290028.
- Saito, M.; Shimazaki, Y.; Nonoyama, T.; Tadokoro, Y. Association between Dental Visits for Periodontal Treatment and Type 2 Diabetes Mellitus in an Elderly Japanese Cohort. J Clin Periodontol 2017, 44 (11), 1133–1139. https://doi.org/10.1111/jcpe.12804.
- Milanesi, F. C.; Greggianin, B. F.; Dos Santos, G. O.; Toniazzo, M. P.; Weidlich, P.; Gerchman, F.; Oppermann, R. V. Effect of Periodontal Treatment on Glycated Haemoglobin and Metabolic Syndrome Parameters: A Randomized Clinical Trial. Journal of clinical periodontology 2023, 50 (1), 11–21. https://doi.org/10.1111/jcpe.13717.
- Sanz, M.; Ceriello, A.; Buysschaert, M.; Chapple, I.; Demmer, R. T.; Graziani, F.; Herrera, D.; Jepsen, S.; Lione, L.; Madianos, P.; Mathur, M.; Montanya, E.; Shapira, L.; Tonetti, M.; Vegh, D. Scientific Evidence on the Links between Periodontal Diseases and Diabetes: Consensus Report and Guidelines of the Joint Workshop on Periodontal Diseases and Diabetes by the International Diabetes Federation and the European Federation of Periodontology. Diabetes Res Clin Pract 2018, 137, 231–241. https://doi.org/10.1016/j.diabres.2017.12.001.
- Ahern, J.; Nunn, J. The Integration of Oral Health-Related Best Practice Recommendations in the Management of Patients with Diabetes: A Cross-Sectional Survey of Primary Care Physicians. J Public Health Dent 2021, 81 (3), 245–248. https://doi.org/10.1111/jphd.12397.
- Zhang, Y.; Qiao, D.; Chen, R.; Zhu, F.; Gong, J.; Yan, F. The Association between Periodontitis and Inflammatory Bowel Disease: A Systematic Review and Meta-Analysis. Biomed Res Int 2021, 2021, 6692420. https://doi.org/10.1155/2021/6692420.
- Anonymous. Evidence Review D for Periodontal Treatment to Improve Diabetic Control in Adults with Type 1 or Type 2 Diabetes: Periodontal Treatment to Improve Diabetic Control in Adults with Type 1 or Type 2 Diabetes: Evidence Review D. 2022.
- Adda, G.; Aimetti, M.; Citterio, F.; Consoli, A.; Di Bartolo, P.; Landi, L.; Lione, L.; Luzi, L. Consensus Report of the Joint Workshop of the Italian Society of Diabetology, Italian Society of Periodontology and Implantology, Italian Association of Clinical Diabetologists (SID-SIdP-AMD). Nutr Metab Cardiovasc Dis 2021, 31 (9), 2515–2525. https://doi.org/10.1016/j.numecd.2021.03.015.
- Herrera, D.; Sanz, M.; Shapira, L.; Brotons, C.; Chapple, I.; Frese, T.; Graziani, F.; Hobbs, F. D. R.; Huck, O.; Hummers, E.; Jepsen, S.; Kravtchenko, O.; Madianos, P.; Molina, A.; Ungan, M.; Vilaseca, J.; Windak, A.; Vinker, S. Periodontal Diseases and Cardiovascular Diseases, Diabetes, and Respiratory Diseases: Summary of the Consensus Report by the European Federation of Periodontology and WONCA Europe. The European journal of general practice 2024, 30 (1), 2320120. https://doi.org/10.1080/13814788.2024.2320120.
- Tangpricha, V. AACE Updated Comprehensive Type 2 Diabetes Management Algorithm with Endocrine Practice; American Association for Clinical Endocrinology, 2023.
- American Diabetes Association Professional Practice Committee. 2. Classification and Diagnosis of Diabetes: Standards of Medical Care in Diabetes—2022. Diabetes Care 2022, 45 (Supplement_1), S17–S38. https://doi.org/10.2337/dc22-S002.

