Why Is the Tongue So Important?

The tongue is far more than a muscle that helps us taste food: it plays a central role in breathing, swallowing, speaking, facial development, and even neurological health. Across fields such as anatomy, neurology, speech‑language pathology, dentistry, and sleep medicine, research consistently highlights how essential the tongue is for everyday function.

Below is an evidence‑based overview of why the tongue matters so much, organized by function and backed by scientific research.

1. Breathing and Airway Maintenance

The tongue is a key player in keeping the airway open, especially during sleep. When the tongue rests too low or falls backward, it can narrow the airway and contribute to obstructive sleep apnea (OSA).

Scientific evidence:

• Isono et al., 1997 (Am J Respir Crit Care Med) showed that tongue position significantly affects upper‑airway collapsibility during sleep.
• Guilleminault et al., 2016 (J Clin Sleep Med) emphasized the tongue’s role in pediatric OSA and highlighted the benefits of myofunctional therapy for strengthening orofacial muscles.

2. Swallowing and Digestion

Swallowing begins with the tongue. It gathers food, forms a bolus, and propels it toward the oropharynx. The tongue also works with the pharyngeal muscles to prevent aspiration and ensure safe, efficient swallowing.

Scientific evidence:

• Logemann, 1998 described the tongue as central to both the oral and pharyngeal phases of swallowing.
• Electromyography studies such as Hirano et al., 2012 (Dysphagia) demonstrate that tongue muscle activity is essential for effective and safe swallowing.

3. Speech and Communication

Clear speech depends heavily on the tongue. It shapes consonants and vowels, coordinates with the lips, teeth, and palate, and fine‑tunes the acoustic qualities of spoken language.

Scientific evidence:

• Kent & Read, 2002 detailed how tongue movements influence the acoustic properties of speech sounds.
• Functional MRI research, including Grabski et al., 2012 (J Speech Lang Hear Res), maps specific tongue movements associated with different phonemes.

4. Facial and Dental Development

Tongue posture – particularly when the tongue rests gently against the palate – plays a major role in craniofacial growth. A chronically low tongue posture can contribute to a narrow palate, malocclusion, and elongated facial structure.

Scientific evidence:

• Harvold et al., 1973 (Am J Orthod) demonstrated in primate models that altered oral posture, including low tongue position, leads to changes in facial growth and dental alignment.
• Proffit et al., 2018 (Contemporary Orthodontics) discusses how tongue posture and function influence jaw development.

5. Taste and Oral Sensation

The tongue houses thousands of taste buds and is rich in sensory receptors that detect texture, temperature, and pain. These sensations help guide food preferences, safety, and enjoyment.

Scientific evidence:

• Chaudhari & Roper, 2010 (Annu Rev Physiol) describe the physiology of taste buds and how the tongue communicates taste signals via cranial nerves.
• Bradley, 2000 (Physiology & Behavior) explains sensory innervation and its role in food selection and safety.

6. Neurological Integration

The tongue is one of the most neurologically complex structures in the body. It is controlled by multiple cranial nerves—hypoglossal (XII) for motor function, and trigeminal (V), facial (VII), glossopharyngeal (IX), and vagus (X) for sensory input. Because of this complexity, tongue function can serve as an important indicator of neurological health.

scientific evidence:

• Kahrilas et al., 1992 (Gastroenterology) explored how brainstem nuclei coordinate tongue and pharyngeal movements during swallowing.
• Clinical studies, such as Ney et al., 2009 (Am J Speech Lang Pathol), show that tongue strength and function can reflect neurological integrity in conditions like stroke or ALS.

Conclusion

The tongue may seem small, but its impact on health is enormous. From keeping the airway open to shaping speech, guiding facial development, and reflecting neurological function, it is involved in nearly every essential activity we perform throughout the day. Understanding how the tongue works and how its posture and strength influence overall well‑being, helps us appreciate why evidence‑based therapies matter. As research continues to grow, so does our ability to support patients with interventions that truly make a difference.