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.
Quick read
The essential study design details in one scan.
EvidenceScore™
Low
Study type
Systematic Review
Follow-up
Short-Term (≤3 mo)
Risk of bias
Some Concerns
Save research, organize studies, and quickly find important evidence again.
Plain-language summary
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
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
Gum attachment level → ↓ (small improvement)
HbA1c → Mixed → (unclear - one positive trial, most showed no effect)
Nerve pain symptoms → ↓ (moderate short-term improvement)
Evidence network
Understand where this research contributes within the broader evidence network.
This study contributes evidence to Photobiomodulation therapy and Clinical attachment level.
This study contributes evidence to
Primary intervention
Photobiomodulation therapy
Primary outcomes
Primary intervention
Primary outcomes
Intervention and outcome relationships this study adds to the evidence network.
Editorial context
See why this paper is useful beyond its individual results.
Evidence network role
This section describes how the study fits into the current evidence network. It does not determine whether an intervention works on its own.
0
Related topics
1
Evidence pairs
0
Related studies
Core evidence
The primary outcomes reported in this study.
Photobiomodulation therapy → Clinical attachment level
Photobiomodulation therapy → Clinical attachment level
Evidence Library
Save research, organize studies, and quickly find important evidence again.
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.
Individual trials were small, with most including fewer than 50 people, so results may not be reliable.
Explore related studies, evidence collections, and research questions.
Relationships organized using the Dediabetes Evidence Intelligence™ framework.
This study contributes to evidence on Photobiomodulation therapy and Clinical attachment level.
This study contributes to the evidence on the following intervention-outcome relationships.
Curated evidence collections and hubs this study is part of.
All studies measuring Clinical attachment level
Measures Clinical attachment level as a key outcome.
All studies on Photobiomodulation therapy
Contributes to Photobiomodulation therapy evidence base.
Jump to pre-filtered views in Evidence Explorer.
1 results
1 results
1 results
Generated from the study's connected evidence using Evidence Intelligence™.
Current evidence does not show a clear benefit of Photobiomodulation therapy for Clinical attachment level.
ConsistencyScore™: Consistency cannot yet be determined from the available evidence.
Ranked evidence signals
Clinical attachment level
EvidenceScore™ Emerging | EvidenceScore™ 59.0 | neutral | ConsistencyScore™ Unclear | 1 study
Why this answer: This answer is based on a single supporting study.
Limitations
Next steps
Choose a next path through related evidence topics, Evidence Explorer views, and research summaries.
Open broader Evidence Explorer views for this relationship.
Read related research summaries.
Focused on evidence, not advertising.
Your data is always protected.
New studies added every day.
