After 40 years, some of the things regarding head and neck function have become clearer. There has been a misunderstanding regarding the importance of the way the head and the neck relate and how compromises affect structural and functional interrelationships. Dentists have learned about the importance of dental function, and how the teeth only meet about 10 minutes each day. We did not appreciate the relationship of the jaw to the head and neck the other 23 hours and 50 minutes. It is important for stability of the upper quadrant that form and function coincide during all 24 hours.