Comparative efficacy of low-level laser therapy (LLLT) to TENS and therapeutic ultrasound in management of TMDs: a systematic review & meta-analysis.

Researchers wanted to know whether low-level laser therapy (LLLT), a treatment that uses gentle light to stimulate tissue, works better than two other electrical and sound-based treatments for temporomandibular joint disorders (TMD), which are conditions affecting the jaw joint and chewing muscles. They gathered and analyzed 12 randomized controlled trials, pooling data from 9 of them to compare how well each treatment reduced pain, muscle tenderness, clicking in the joint, and improved how wide people could open their mouth. Low-level laser therapy appeared to work somewhat better at reducing pain compared to both TENS (transcutaneous electrical nerve stimulation, a mild electrical treatment) and therapeutic ultrasound (high-frequency sound waves).

The evidence for improvement in mouth opening also favored LLLT, though the certainty varied across different comparisons.

If you live with jaw joint pain or dysfunction, you might have heard about different ways to treat it, including laser therapy, electrical stimulation, and ultrasound. This review looked at studies comparing these three approaches to see which one helped people most with pain relief and jaw function.

The findings suggest that low-level laser therapy, which uses a gentle beam of light aimed at the painful area, was associated with somewhat better pain reduction than the electrical stimulation treatment (TENS) and also somewhat better than ultrasound. The same pattern appeared for improving how wide people could open their mouth, though the gains were modest.

That said, this is a summary of research studies, and what works best can vary from person to person depending on your specific condition and other factors.

This is a summary of research, not medical advice. Talk to your own healthcare provider about anything affecting your care.

This systematic review and meta-analysis compared the efficacy of LLLT, TENS, and therapeutic ultrasound across 12 RCTs (9 included in meta-analysis) for pain, muscle tenderness, joint clicking, and mouth opening in TMD populations. The pooled evidence suggests LLLT showed somewhat greater pain reduction compared to TENS (at 95% confidence) and compared to ultrasound (at 81% confidence).

Mouth opening improvements also favored LLLT, though confidence intervals and heterogeneity across studies suggest the magnitude of benefit should be interpreted cautiously. The lower confidence level for the LLLT versus ultrasound comparison is worth noting when weighing the evidence.

The review does not provide data on whether these differences translate to clinically meaningful functional gains or long-term outcomes, nor does it offer guidance on patient selection or treatment parameters. The actual risk of bias across included trials and any inconsistencies between studies are not detailed in the abstract, so the overall certainty of the evidence remains somewhat opaque.