tooth pain or sinus pain

[nitabean]

I had a cavity filled a few months ago. The dentist said that the cavity was pretty close to the root and I might need a root canal. I frequently have pain on that side of my head. The tooth itself doesn't seem to hurt when I touch it. But it is giving me a sort of dull headache on that side of my face, that usually lasts a few days and it feels like my sinus is being affected. Obviously this is a normal occurence, but can that tooth still become infected, or is this pain simply from the root being irritated?

[marcym3]

I had an upper tooth (1st premolar) that had a root canal about 15 years ago. Recently it has been bothering me. Throbbing, pulsating, dull ache. I went to endodentist and he did X-ray. The X-ray looked great. No issues. He did say my sinus cavity is very close to that tooth and I could have some inflammation from my sinuses that is bothering the tooth. He called in amoxicillin for me. I just started it tonight. The tooth is killing me. I have never heard of sinuses causing issues with ONE tooth. Is that possible?

[scottma]

Seeing an endodontist to rule out pulp pathology is advised