Integrative management of periodontitis in type 2 diabetes patients: The emerging role of herbal medicine

Abstract

This editorial comments on the study by Lin et al, recently published a study in World Journal of Diabetes, which provides compelling real-world evidence that long-term use of medicinal herbs may reduce the risk of periodontitis and decrease ambulatory care utilization in patients with type 2 diabetes (T2D). Using Taiwan’s National Health Insurance database and a propensity-score-matched cohort of 9728 individuals, the authors reported a 52% reduction in periodontitis incidence among those receiving herbal therapy for more than two years. These findings align with growing evidence on the bidirectional relationship between T2D and periodontitis, driven by chronic inflammation, oxidative stress, and dysregulated host-microbial interactions. Recent clinical and mechanistic studies show that herbal phytochemicals - including Aloe vera, green tea catechins, curcumin, Triphala, licorice, cinnamon extracts and neem - exert anti-inflammatory, antioxidant, antimicrobial, and osteoprotective actions. By modulating pathways such as nuclear factor kappaB and NOD-like receptor protein 3 and supporting redox balance and bone metabolism, these botanicals offer a biologically plausible adjunct to conventional periodontal and metabolic care. Given the rising global burden of both T2D and periodontal disease, incorporating validated herbal formulations into interdisciplinary diabetes management could represent a valuable, non-invasive strategy to prevent complications and improve quality of life.

Key Words: Periodontitis; Type 2 diabetes; Herbal medicine; Inflammation; Antioxidants

Core Tip: The real-world cohort study by Lin et al demonstrates that adding traditional medicinal herbs to standard diabetes care reduces the incidence of periodontitis and the use of dental ambulatory services. Herbal therapies may modulate inflammation and promote bone remodeling, providing a safe, cost-effective, and integrative strategy to manage oral complications in patients with type 2 diabetes.

This editorial refers to " Real-world evidence for herbal medicine benefit in 9728 type 2 diabetes patients-peridonotitis risk and ambulatory care utilization" by Lin et al, 2025; https://doi.org/10.4239/wjd.v16.i11.112171.

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INTRODUCTION

Periodontitis and type 2 diabetes (T2D) are both chronic inflammatory diseases affecting hundreds of millions of patients worldwide[1]. The association between them is now firmly established. Hyperglycemia induces microvascular damage, enhances oxidative stress, and increases production of pro-inflammatory cytokines such as interleukin (IL)-1β, IL-6, and tumor necrosis factor (TNF)-α, contributing to periodontal tissue breakdown[2-4]. Conversely, untreated periodontitis exacerbates systemic inflammation, worsens insulin resistance, and accelerates diabetic complications, including nephropathy and cardiovascular disease[5,6].

Recent epidemiologic data confirm that regular periodontal care in diabetic patients reduces long-term adverse outcomes, including a lower risk of dialysis initiation[7]. Lin et al’s data[1] now add that medicinal herbs - when taken continuously - may offer additional protection by reducing periodontal complications in T2D.

HERBAL MEDICINES: STRENGTHENING EVIDENCE FROM CLINICAL STUDIES AND LIMITATIONS

Lin et al[1] recently published a study in World Journal of Diabetes reported a striking 52% reduction in incident periodontitis among T2D patients who used medicinal herbs for more than two years. This encouraging reduction in incidence is an association and cannot alone establish causation. However, these findings are highly consistent with a growing body of randomized clinical trials demonstrating that herbal agents, used adjunctively with scaling and root planning (SRP), significantly improve periodontal indices.

Evidence from clinical trials include several natural agents: (1) Aloe vera gels reduce probing depth and gingival inflammation, with efficacy comparable to chlorhexidine[8]; (2) Curcumin, in mouthwashes or gels, decreases plaque, bleeding, and inflammatory markers in periodontitis patients, and also delays onset of radiation-induced mucositis[9-11]; (3) Green tea catechins reduce oxidative stress and inhibit periodontal pathogens[12]; (4) Triphala mouthwash shows similar clinical improvements to chlorhexidine but without its side effects[7,13]; (5) Neem (Azadirachta indica), licorice (Glycyrrhiza glabra), and Terminalia species formulations demonstrate antimicrobial, anti-inflammatory, and patient-acceptable effects[7,13]; (6) Polyherbal mouthwashes integrating Emblica officinalis, Terminalia chebula, T. bellerica, licorice, and neem have been validated in clinical trials as effective adjuncts to SRP without adverse events[7]; and (8) Cinnamaldehyde, the main bioactive compound of Cinnamomum species has shown significant efficiency to attenuate periodontal bone loss, reducing gingival expression of key inflammatory mediators, and lowering salivary nitric oxide levels[14,15]. Cinnamaldehyde also modulated host immune responses, reducing IL-1β and TNF-α release and attenuating lymphocyte proliferation[16], and exerting anti-inflammatory, antioxidant, and osteoprotective effects[17].

Despite these encouraging findings, it is important to recognize the inherent limitations of the real-world evidence presented by Lin et al[1]. Their analysis, although based on a large national cohort, remains observational and therefore susceptible to residual confounding, selection bias, and incomplete standardization of herbal formulations and dosing regimens, precluding any definitive causal inference. In addition, the protective association was observed primarily among individuals with continuous herbal use exceeding two years, whereas shorter durations did not show a comparable effect, suggesting that sustained modulation of inflammatory and osteometabolic pathways - and long-term patient adherence - may be necessary to achieve clinically meaningful benefits.

MECHANISTIC PLAUSIBILITY: MULTI-TARGET ACTIONS ON KEY BIOLOGICAL PATHWAYS

The mechanistic rationale supporting the adjunctive use of herbal medicines in patients with T2D-associated periodontitis is grounded in the convergence of inflammatory, oxidative, microbial, and osteometabolic pathways that are dysregulated under hyperglycemic conditions. In diabetes, sustained hyperglycemia amplifies periodontal tissue destruction by enhancing nuclear factor kappaB signaling, activating the NOD-like receptor protein 3 inflammasome, increasing reactive oxygen species production, and disrupting bone remodeling, collectively impairing host defense and wound healing capacity.

Among these mechanisms, chronic inflammation and oxidative stress represent the most consistently validated drivers in diabetic periodontal models. Experimental studies show that phytochemicals such as curcumin gingerols, catechins, proanthocyanidins, rosmarinic acid, and Triphala-derived compounds suppress nuclear factor kappaB activation and reduce the expression of key pro-inflammatory mediators[7,11,13], including IL-1β, TNF-α, and IL-6, which are markedly upregulated in hyperglycemic environments[18-21]. In parallel, polyphenol-rich botanicals enhance endogenous antioxidant defenses through activation of the nuclear factor erythroid 2-related factor 2 pathway and upregulation of enzymes such as superoxide dismutase, catalase, and heme oxygenase-1, thereby counteracting oxidative stress that links metabolic dysregulation to periodontal breakdown[18,19,22].

Microbial dysbiosis and biofilm resilience, which are exacerbated in diabetic patients, constitute a second key mechanistic axis. Hyperglycemia favors pathogenic biofilm composition and impairs immune clearance, amplifying periodontal inflammation. Several botanical agents - including green tea catechins, cranberry proanthocyanidins, neem extracts, curry leaf constituents, and propolis - have demonstrated antimicrobial and anti-biofilm activity against major periodontal pathogens such as Porphyromonas gingivalis, Tannerella forsythia, and Aggregatibacter actinomycetemcomitans[13,18,23]. Importantly, these effects extend beyond simple bacterial suppression, as certain phytochemicals interfere with bacterial adhesion, membrane integrity, and quorum sensing, thereby targeting biofilm pathogenicity rather than indiscriminate microbial eradication.

A third mechanistic pillar with particular relevance in diabetes is the modulation of bone metabolism. Diabetic conditions are associated with enhanced osteoclastogenesis, impaired osteoblast function, and delayed bone healing. Experimental data indicate that several herbal compounds reduce receptor activator of nuclear factor-kappaB ligand expression, inhibit osteoclast differentiation, and promote osteoblastic activity, thereby mitigating alveolar bone loss under inflammatory and metabolic stress[20,21]. Cinnamaldehyde and cinnamic acid derivatives, in particular, have demonstrated the ability to attenuate periodontal bone loss while simultaneously reducing local inflammatory mediators and oxidative markers in experimental periodontitis models[14,17]. Finally, enhanced wound healing and immune regulation further contribute to the biological plausibility of herbal adjuncts in diabetic periodontal care. Compounds such as acemannan from Aloe vera stimulate fibroblast proliferation, extracellular matrix deposition, and epithelial repair, processes that are notably impaired in diabetic tissues. Licorice extracts additionally support mucosal protection and salivary function, potentially improving the oral microenvironment and patient tolerance to therapy[7,13,24].

Together, these multi-layered effects support the rationale that herbal therapy is not simply antiseptic but modulates inflammatory, oxidative, and microbial networks central to both periodontal and metabolic health.

It is also important to distinguish between complex herbal formulations and isolated phytochemicals, which should not be considered interchangeable. Whole-herb or polyherbal preparations contain multiple bioactive constituents that may act synergistically or antagonistically across inflammatory, oxidative, microbial, and osteometabolic pathways, potentially producing effects that differ from those observed with purified, high-dose single compounds. In contrast, isolated phytochemicals allow clearer mechanistic attribution but may not fully capture the pharmacodynamic complexity, safety profile, or clinical behavior of traditional formulations. Accordingly, mechanistic insights and clinical outcomes derived from these two approaches should be interpreted within their respective contexts.

SYNERGY WITH DIABETES MANAGEMENT

Herbal therapies may be particularly advantageous in T2D patients. Hyperglycemia exacerbates periodontal inflammation, while periodontal treatment improves metabolic parameters. Several botanicals used in periodontitis - such as green tea polyphenols, curcumin, resveratrol, and Triphala - also exert systemic metabolic benefits, improving insulin sensitivity, reducing oxidative stress, or modulating gut and oral microbiota[18-20,22,23].

Lin et al’s finding[1] thus reinforce a broader integrative care model in which modulation of local oral inflammation supports overall metabolic balance. Importantly, herbal therapies should be viewed strictly as adjuncts to, and not substitutes for, evidence-based periodontal and metabolic care. Mechanical biofilm control through SRP, optimization of glycemic control, and patient education remain the cornerstones of periodontal management in patients with T2D. Within this framework, validated herbal formulations may enhance therapeutic outcomes by modulating inflammation, oxidative stress, and microbial dysbiosis, but their use must be integrated alongside conventional clinical protocols rather than replacing them.

PUBLIC HEALTH IMPLICATIONS: TOWARD INTEGRATED, INTERDISCIPLINARY CARE

The global rise in T2D and periodontitis demands innovative strategies that transcend disciplinary silos. Evidence supports several integrated and interdisciplinary care. Routine periodontal screening in diabetes care pathways, supported by large epidemiological analyses showing the impact of periodontal status on diabetic complications, including reduced dialysis initiation in patients receiving regular periodontal care[6]; and by reviews demonstrating the bidirectional disease burden[3,18]. Integration of botanical therapies with SRP and patient education, validated by multiple randomized clinical trials showing that adjunctive herbal agents (Aloe vera, curcumin, Triphala, neem, licorice, polyherbal rinses) significantly improve periodontal indices beyond SRP alone[4,7,8,13]. Inclusion of oral health metrics in diabetes management guidelines, supported by studies documenting systemic benefits of periodontal therapy in T2D, including lower systemic inflammation and reduced metabolic complications[5-7]; and reinforced by public-health reviews highlighting the need for interdisciplinary integration[21,25]. Development of standardized, safe herbal formulations with supporting mechanistic rationale, documented in systematic and phytotherapy reviews emphasizing formulation quality, reproducibility, and bioactive standardization in botanical periodontal therapies[10,13,19,21,26]. Promotion of preventive, culturally adapted integrative care models, recommended by global public-health analyses on medicinal plant use in dentistry[21], microbiome-modulating phytochemicals[27], and preventive botanical mouthwashes with good patient acceptance[7,13].

Such approaches can reduce healthcare costs, improve patient quality of life, and prevent systemic complications associated with chronic inflammatory burden in T2D[1,3,5,6]. However, the implementation of integrative herbal approaches in routine diabetes-periodontitis care faces practical challenges, including variability in cultural acceptance, cost and reimbursement structures, practitioner training, and regulatory oversight of botanical products. Addressing these barriers through education, evidence-based guidelines, and regulatory harmonization will be essential to ensure safe, equitable, and effective integration into mainstream healthcare pathways.

FUTURE DIRECTIONS

Despite the encouraging real-world and clinical evidence supporting adjunctive herbal therapy, important questions remain before such approaches can be fully integrated into routine periodontal and metabolic care. Large, multicenter randomized controlled trials specifically targeting diabetic populations are needed to confirm long-term benefits, evaluate dose-response relationships, and determine whether particular patient subgroups respond more favorably. Advances in multi-omics, imaging, and artificial intelligence may also help delineate the molecular pathways modulated by herbal compounds, identify predictive biomarkers of treatment response, and clarify how botanical agents interact with dysregulated inflammatory and metabolic networks in T2D.

An additional challenge is the considerable heterogeneity of herbal preparations used across studies and in routine practice. Variations in plant species, extraction processes, bioactive concentrations, and dosing regimens limit reproducibility and complicate comparison across trials. Establishing standardized, quality-controlled formulations - supported by rigorous pharmacokinetic, toxicological, and manufacturing data - will be essential to ensure consistent therapeutic effects and to enhance scientific validity. Addressing these issues will strengthen the translational pathway from promising experimental findings to reliable, patient-centered applications.

CONCLUSION

The study by Lin et al[1] provides high-quality real-world evidence that long-term herbal therapy significantly is associated with a reduced risk of periodontal complications in patients with T2D. Supported by extensive clinical and experimental research, herbal medicines represent safe, effective, and biologically plausible adjuncts to periodontal and metabolic care. Their integration into diabetes management offers a promising path toward more holistic, preventive, and patient-centered healthcare.