Swallowing doesn’t seem like strenuous exercise, but consider the fact that people do it on average 2000 times a day and suddenly it starts adding up.
Most people can handle this rigorous exercise routine, but people with missing teeth or poor tooth alignment have to put a little bit more effort into swallowing, resulting in headaches and jaw pain from strained muscles. The resulting pain can manifest itself in the eyes, ears, sinuses, cheeks, or the sides of the head.
Obviously not all facial pain is a result of missing or misaligned teeth. If you feel pain in the jaw and head, experts recommend you go see a dentist in order to rule out other possible causes of pain such as, TMJ, stress, muscle spasms.