I had a root canal in July and a retreatment three weeks ago. Both were done by a trusted endodontist on an upper right hand molar. Since then I've had sinus/jaw pain-\-a throb really on that side. Sometimes it gives me a headache. My dentist took an xray on Thursday and did and an exam for crown placement. She told me that the tooth looked good, but that my sinus cavity looked "cloudy." I'm not convinced that I don't have an infection in that tooth. I'm not sure what to do. I guess I'm wondering what my options are at this point.