Photobiomodulation shows small periodontal benefits but mixed systemic effects in type 2 diabetes
Last updated May 26, 2026
Key finding
Photobiomodulation shows small gum health benefits but inconsistent effects on blood sugar and inflammation in type 2 diabetes.
This systematic review examined photobiomodulation therapy (PBMT) in adults with type 2 diabetes across 10 randomized trials. Researchers tested whether PBMT could improve blood sugar control, reduce inflammation, or help with nerve damage. The main results show small improvements in gum health (0.2-0.3 mm in clinical measures), but effects on blood sugar and inflammation were inconsistent. One trial found meaningful HbA1c reductions, but most others showed no benefit. PBMT provided short-term symptom relief for painful neuropathy but did not improve nerve structure. Overall, effects varied widely across studies, and benefits appear modest at best.
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Study at a glance
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EvidenceScore™
Low
Study type
Systematic Review
Follow-up
Short-Term (≤3 mo)
Risk of bias
Some Concerns
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Plain-language summary
What this paper says
A plain-language read of the study’s main message and where it applies.
Study focus
Photobiomodulation shows small gum health benefits but inconsistent effects on blood sugar and inflammation in type 2 diabetes.
Published in
Journal Reference
Publication details and source links for this paper.
Wevers A, San Roman-Mata S, Navarro-Ledesma S, Pruimboom L. Effects of Photobiomodulation on Metabolic, Inflammatory, and Neurological Outcomes in Type 2 Diabetes: A Systematic Review and Meta-Analysis. Int J Mol Sci. 2026;27(1):440. doi:10.3390/ijms27010440
Main Effects
Gum attachment level → ↓ (small improvement)
HbA1c → Mixed → (unclear - one positive trial, most showed no effect)
Nerve pain symptoms → ↓ (moderate short-term improvement)
Evidence Suggest
- Photobiomodulation may produce small improvements in gum health when used alongside standard periodontal treatment, but the clinical importance of 0.2-0.3 mm changes is unclear.
- Effects on blood sugar control are inconsistent, with most trials showing no benefit and one trial showing meaningful improvement.
- Short-term symptom relief was seen for nerve pain, but structural nerve improvements were not observed.
Who this applies to
Adults with type 2 diabetes who have gum disease or painful diabetic neuropathy. Results come from small studies with participants mainly in their 40s to 60s from Brazil, Egypt, India, Kosovo, Saudi Arabia, and Turkey.
Keep in Mind
Individual trials were small, with most including fewer than 50 people, so results may not be reliable.
Between the Lines
- Very small individual trials
- Treatment methods varied widely
- Short follow-up periods
- Incomplete reporting in many studies
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