Dental Occlusion, Brain Function, and Hearing Health

A new review paper confirms the brain and the jaw have a two-way conversation. Research by Bingfeng Dai, Ziming Zhao, and Jie Lin synthesizes evidence showing that dental occlusion—how your teeth fit together—directly influences brain structure and function, while the brain simultaneously regulates jaw position and muscle tone. This bidirectional relationship has significant implications for understanding and managing conditions like tinnitus, misophonia, and hyperacusis.

How Occlusion Feeds Information to the Brain

The review, published in Frontiers in Neurology, explains that the teeth and their supporting structures are dense with sensory receptors. Every bite, clench, or even light tooth contact sends a stream of information to the central nervous system. This occlusal input travels via the trigeminal nerve and is processed in the brainstem and higher cortical areas.

This sensory data is not isolated; it modulates activity in brain networks responsible for fine motor control of the jaw and neck, but also appears to influence cognitive functions and emotional states. The authors note that altering occlusion in experimental settings can lead to measurable changes in brain activity patterns, suggesting the jaw’s position acts as a continual reference point for the nervous system.

The Brain’s Role in Regulating Jaw Position

The relationship is not one-way. The brain exerts powerful top-down control over the masticatory system. Conditions that affect brain function—such as chronic stress, neurological injury, or neurodevelopmental disorders—can disrupt the delicate homeostasis of the jaw muscles and joint.

This can manifest as bruxism (teeth grinding), altered resting jaw posture, or temporomandibular disorder (TMD) pain. The authors stress that viewing occlusion solely as a mechanical problem misses this critical neurological component. A hyperactive stress response, for example, can increase muscle tone and change bite force, which then feeds back into the brain’s sensory circuits, potentially worsening conditions like hyperacusis or tinnitus through shared neural pathways.

Distinguishing Evidence and Accounting for Confounders

A strength of this review is its critical evaluation of evidence. Dai and colleagues clearly separate findings from animal models, which allow for detailed mechanistic study, from human clinical studies, which are more applicable but less controlled.

They also account for major confounding factors. Periodontitis and systemic inflammation release cytokines that can affect both peripheral nerves and central brain function, potentially mimicking or exacerbating occlusion-related effects. This means research must carefully distinguish between problems originating in the tooth socket versus those rooted in the brain. Failing to control for these factors weakens the conclusions of many studies.

Methodological Limits in Neuroimaging Research

The paper highlights specific limitations in how neuroscience currently studies occlusion. Neuroimaging studies often use small sample sizes and varied techniques (fMRI, EEG, PET), making direct comparisons difficult. The act of clenching or biting during a brain scan can cause motion artifacts, and it is challenging to design a true “sham” occlusal intervention for control groups.

These limitations mean that while correlations between occlusion and brain activity are observed, establishing definitive cause and effect remains complex. The authors call for more standardized, rigorous protocols in future research.

Practical Implications for Hearing and Sensory Health

This synthesis has direct relevance for clinical practice. The trigeminal nerve (jaw) and auditory nerve pathways converge and interact in the brainstem. Aberrant signals from a malocclusion or dysfunctional jaw joint could theoretically influence auditory processing, potentially acting as a contributor or aggravating factor for tinnitus and misophonia.

For patients with these overlapping conditions, an interdisciplinary assessment becomes important. A treatment plan might logically involve both audiological management and a dental or orofacial pain evaluation to assess occlusal contributors. This is not to suggest dental work is a cure, but that it may be one piece of a comprehensive management strategy, especially where a clear dental issue coincides with sensory symptoms. Our previous article explores more on these specific links between occlusion and hearing health.

Furthermore, the link to emotional states underscores the role of stress. Since stress can disrupt both brain function and occlusion, stress-reduction techniques become a logical supporting intervention. The bidirectional cycle seen here is similar to the documented relationship between tinnitus and sleep disturbance, where each problem worsens the other.

A Framework for Future Collaboration

The work by Dai, Zhao, and Lin provides a robust framework for future research and collaboration. It moves past simplistic models and presents a dynamic, interactive system connecting the mouth and the brain. For basic neuroscientists, it highlights the orofacial system as a key window into sensorimotor integration. For clinicians in dentistry, neurology, and audiology, it argues for shared language and assessment protocols.

Effectively addressing complex, comorbid conditions requires understanding these connections. Managing a patient’s tinnitus or sound sensitivity may benefit from considering the full spectrum of sensory inputs to the brain, including those coming from the teeth and jaw.

The full review, “The Bidirectional Interactions Between Dental Occlusion and Brain Function,” is available for review (DOI: 10.3389/fneur.2026.1841493).