A recent article about chronic headaches and gum chewing among teens has clearly shown that all test subjects reported significant or complete improvement of their headache complaints when they stopped chewing gum.
Headaches returned when, you guessed it, gum chewing resumed!
So for all you frequent gum chewers with chronic headaches, tossing away that pack of gum may be the answer!
The Influence of Excessive Chewing Gum Use on Headache Frequency and Severity Among Adolescents. Watemberg N, Matar M et al: Pediatric Neurology 2014; 50 (January): 69-72.