The Tongue Beyond Position: From Oral Posture to Biofunctional Breathing and Facial Growth

The tongue is commonly discussed in terms of its position, strength, and muscular function. However, within the Biofunctional Model, the tongue represents one component of a broader functional system involving breathing, swallowing, oral posture, pressure regulation, and craniofacial development.

In this lecture, Dr. Sandra Kahn will present a biofunctional perspective on the role of the tongue within the naso-oro-pharyngeal system, focusing on the interaction between the tongue, palate, lips, soft palate, pharynx, and nasal airway. The presentation will introduce the concept of biofunctional units, valves, and compartments, emphasizing how these structures interact dynamically to regulate pressure and function.

A central concept will be the Up-lock, the functional repositioning of the tongue following swallowing. Rather than viewing tongue elevation simply as a muscular exercise, the Up-lock is understood within a system in which swallowing, compartment formation, and pressure changes contribute to establishing a stable resting position of the tongue against the palate. This position is associated with nasal breathing and the functional organization of the upper airway during rest and sleep.

The lecture will examine why swallowing is fundamental to resting tongue posture. Within the Biofunctional Model, swallowing represents a transition between the mechanics of solids and the dynamics of fluids. The formation and maintenance of appropriate oral compartments, together with the coordinated action of the tongue and other oral valves, allows the system to establish functional equilibrium after swallowing.

Dr. Kahn will then connect oral posture with nasal breathing and craniofacial development. The Forwardontics approach proposes that the development and maintenance of facial architecture cannot be considered independently from the functional environment in which it develops. Persistent, low-intensity forces generated by oral posture and function may influence the direction of craniofacial development, making functional assessment an important component of early intervention.

The presentation will conclude by proposing a broader clinical perspective: the objective is not simply to “train the tongue,” but to understand the conditions that allow the tongue, airway, swallowing mechanism, and surrounding structures to function as an integrated system.

By connecting tongue posture, swallowing, pressure, nasal breathing, airway function, and facial growth, this lecture will introduce a shift from viewing the tongue as an isolated therapeutic target toward understanding it as a central element of a dynamic biofunctional system.