The swallow is the most complex reflex activity the human nervous system performs, and it is done without conscious effort. Reflexes provide the underlying framework of neural control upon which more complex motor responses can build. Reflexes from the oropharyngeal area protect the anterior portal of the gastrointestinal tract, transport food and liquids, provide an airway for gaseous exchange by the lungs and protect the lungs from aspiration of foods and liquids.
The ideal equilibrium for head balance is with nasal breathing, sealed lips, dental arches slightly apart at rest and the tongue positioned in the roof of the mouth. In deglutition, to provide maximum bracing for the head on the spinal column, the teeth touch in a position of maximum occlusion, the lips are sealed and the tongue propulses the bolus distally against the palate.
There is universal agreement that the teeth and dental alveoli lie in a position of equilibration between the cheeks, lips and tongue. Ideally the tongue is in contact with the roof of the mouth at rest, during subconscious swallow and during nasal breathing. The tongue exerts an outward and forward force, counterbalanced by the inward pressure of the cheeks and lips. When the tongue is positioned in the roof of the mouth it functions ideally and produces healthy palatal and dental development. LOOK WHAT A TONGUE CAN DO TO A BITE. THESE KIDS HAVE OBSTRUCTED NASAL BREATHING
LOOK WHAT A TONGUE CAN DO TO A BITE. THESE KIDS HAVE OBSTRUCTED NASAL BREATHING