Q. I had a white composite filling done two months ago on a back upper tooth. The dentist told me to expect some sensitivity as it was a large filling (and the drilling caused some sensitivity at the time) but the sensitivity is getting worse. Now when I eat or drink I get a dull radiating pain into my jaw which can last for up to an hour. I’m a little nervous that it might need a root canal, so I’ve been delaying calling and hoping it will resolve itself. I also think I might have exacerbated the sensitivity as I didn’t brush the filling well once it started being sensitive and someone told me this might actually have done more harm than good. I’ve started thoroughly brushing that tooth now (been doing this less than a week and still get pain, though not quite so often). Should I continue thorough brushing and see if the pain abates or is this pain a sign of something more serious and should I call my dentist?