Masseter Muscle TENS Therapy for Tinnitus Relief

Pencil-electrode transcutaneous electrical nerve stimulation (TENS) applied to the jaw muscle significantly reduced tinnitus severity and bruxism symptoms in a 2026 randomized controlled trial. Researchers at Ankara University reported a marked decrease in tinnitus handicap and jaw discomfort after a five-week treatment regimen in patients with normal hearing.

Study Design: Targeting the Jaw-Muscle Connection

Led by Zehra Aydoğan and colleagues, the study focused on a specific tinnitus subgroup: individuals with chronic subjective tinnitus related to bruxism (teeth grinding or clenching) and normal hearing thresholds. Thirty-one adults were randomly assigned to either a TENS treatment group (18 people) or a control group (13 people).

The TENS group received stimulation to the masseter muscle—the primary jaw muscle used in chewing—four times per week for five weeks. They used a specialized “pencil-electrode” TENS unit, designed for precise application. The control group received no intervention during this period. All participants had normal hearing, ruling out peripheral hearing loss as the primary driver of their tinnitus in this experiment.

Outcomes were measured using validated tools: the Tinnitus Handicap Inventory (THI), Visual Analog Scales (VAS) for tinnitus and jaw pain, anxiety (GAD -7), and the Oral Behavior Checklist (OBC). The team also measured mandibular range of motion and used the SF-36 survey for quality of life.

Significant Reductions in Tinnitus and Bruxism Measures

The data showed clear benefits for the group receiving masseter TENS. Post-treatment, their total THI score and all its sub-scores (functional, catastrophic, emotional) were significantly lower. The intensity of their tinnitus, as reported on the VAS, also dropped.

Critically, the therapy addressed the bruxism component. Scores for bruxism-related jaw discomfort on the VAS fell. Participants reported fewer oral parafunctional behaviors on the OBC, and their actual physical ability to move their jaw (mandibular ROM) improved. Anxiety levels (GAD-7) decreased, and two subscales of the SF-36—pain and general health—showed positive change.

“No significant changes were observed in the control group,” the authors state. This contrast strengthens the conclusion that the improvements were due to the TENS treatment itself, not the passage of time or placebo effects.

How Might Jaw Stimulation Quiet Tinnitus?

The proposed mechanism is somatosensory neuromodulation. Bruxism creates tension and altered sensory input from the trigeminal nerve system in the face and jaw. This aberrant signal is thought to influence auditory pathways in the brain, potentially contributing to or sustaining the perception of tinnitus.

Applying TENS to the masseter muscle may normalize this input. The electrical stimulation could help “reset” or modulate the neural activity in these interconnected somatosensory and auditory brain networks, reducing the central gain that leads to the phantom sound of tinnitus. This aligns with the growing understanding of tinnitus as a network disorder of the brain, not just an ear problem. Research into cerebellar and other central nervous system contributions further supports this model.

The approach is distinct from sound-based therapies and targets a specific somatic trigger. It also differs from cervical (neck) nerve treatments, which have a different anatomical focus and, as noted in a review of adverse events, can carry different risks like vasovagal syncope.

Practical Implications for Patients and Clinicians

This study points to a practical, non-invasive treatment option for a identifiable patient group. The first step is a thorough assessment to identify a potential link between tinnitus and jaw issues. Audiologists and otolaryngologists can screen for bruxism signs—such as jaw pain, morning soreness, or tooth wear—and refer to dental or TMD specialists for confirmation.

For those with confirmed bruxism-associated tinnitus, pencil-electrode masseter TENS presents a promising adjunctive therapy. The protocol of four sessions per week for five weeks requires clinical supervision but is generally low-risk. The dual benefit for both tinnitus distress and bruxism discomfort is a significant advantage.

It is important to note this therapy is likely not a universal cure. It is designed for tinnitus with a somatic component from the jaw. For tinnitus primarily linked to hearing loss, other management strategies, including sound therapy and habituation techniques, remain central. The study also adds to the evidence that addressing comorbid conditions like anxiety is integral to comprehensive tinnitus care.

Future Directions and Cautious Optimism

While the results are positive, larger-scale and longer-term studies are needed to confirm durability and refine protocols. Future research should also investigate the combined effect of masseter TENS with other established therapies.

The work by Aydoğan et al. provides a clear, evidence-based path for a subset of tinnitus sufferers. By physically targeting the jaw muscle, they have demonstrated a direct way to modulate the tinnitus percept, offering a new tool that is both specific and rooted in the neuroscience of somatosensory-auditory integration.

The full study, “Targeting Tinnitus via Masseter Muscle Stimulation: Innovative Pencil-Electrode TENS Therapy for Bruxism-Associated Tinnitus,” is available in Brain and Behavior (DOI: 10.1002/brb3.71443, PMID: 42050847).