Sinus infections

The autonomic nerves that go to the sinuses travel with the trigeminal nerve and exchange a lot of information with each other.  So when the bite is off and the trigeminal nerve is hypertonic, it alters the quantity, quality, and viscosity of nasal secretions.  Trigeminal disturbance also impacts immune function, thus making the sinuses vulnerable to infection.  Repetitive sinus infections are a common symptom with jaw malalignment.