I have pain under my jaw, the right side of my neck?

i know i have a hole in my tooth at the very back, because i went to my dentist and i need to go back for fillings. so maybe this could be causing it? tho my tooth isnt hurting yet. but i have a very sore area just under my jaw on the right side of my neck, it isnt swollen but hurts to touch. its been like ths since my dentist appointment last week. im woried incase it isnt to do with my teeth and something mre serious. anyone any idea on what is wrong?