Multiple recent case studies have reminded me of how the bite can have a major influence on brain cognition. Bite dysfunction, by multiple pathways, can cause total loss of cognition or cloudy thinking. This effect is likely to be caused by way of reduced brain blood flow (trigeminal vascular system), glial activation (elevated substance P), trigeminal influence on reticular sensory integration, altered brain neurotransmitters (elevated substance P), and other pathways.
There are likely many undiagnosed cases of bite dysfunction causing cognitive impairment. In the recent cases that I have seen, the situation was present for many years prior to proper diagnosis. Diagnosis is arrived at by understanding dental orthopedic principles and the neurological impact of disturbances within the trigeminal system.