This is the most common reason why one thinks of a dentist and of a dental visit, rather this is why dentist exist.
A damaged filling
Repetitive motions, such as chewing gum or grinding teeth
An exposed root.
Disease of the jaw joint (TMJ)
Spasms of the muscles used for chewing
-Diseases of the heart (angina or heart attack)
-Neurological disorder -Neuralgias