Dentists... What Do You Think... Unresolved Issue and Very Concerned?

My DDS and I are a bit stomped but are thinking mostly it's grinding and clinching. However, I have an upper tooth that hurts into my sinuses. Here's the best description of what is going on. When air hits it, it sort of pinches right in the area where the old filling is and only hurts from that area up into my sinuses. The filling is on the corner of my upper 2nd molar. In that filling area, is also at times a tiny bump. DDS says no RC. I'm wondering if it's cracked right in that filling area, and that's causing a tiny infection in gum. Sens to cold but not hot. What do you think Dentists? Thanks for your help.

Dentists... What Do You Think... Unresolved Issue and Very Concerned?
To begin with, your DDS should have already taken Xrays to determine if you have recurrent decay he can't see visually or do you in fact have an abscess at the root of the tooth. Because you say that only one tooth is reacting and it's creating sinus discomfort it may be the tooth and then again it may actually be a sinus infection issue. Fractures in a tooth is often very difficult to see but can cause the symptoms you describe. The tiny bump tends to make me believe that you are dealing with an abscess. Abscesses often work their way up the side of a tooth and when they reach the surface that allows the gasses created by the abscess to escape. Abscess gas build up is what puts pressure on the tooth's nerve and causes pain. If no abscess is visible on the Xray, your next stop should be to see a ENT doctor. One other issue, an abscess can actually cause a tooth to slightly move out and that could cause the tooth to strike the opposing tooth quicker than the rest of the teeth occlude when chewing. That premature occlusion contact can also cause the tooth to be painful. Good luck and I wish you well.