Millions of people suffer from headaches. It has been estimated that over 50% of them are actually of dental origin. We know from Williams and Lundquist EMG studies, as well as Mansour and Reynik’s work that posterior interferences increase bite forces dramatically and also increase muscle activity of the masseters and the temporalis.
This overloaded musculature is often the trigger for these headaches. So when we see people with headaches and signs of instability, we should actually be prescribing and occlusal analysis, not Imitrex (sumatriptan).