A public service announcement, I guess... Just had this happen to me for the third time in my life, where either a dentist or an Ear Nose and Throat doctor misses a diagnosis of an old root canal tooth that's gone wrong, causing infection of the facial bone, which infection may have been going on for years. You'd like to trust them to catch these problems, but my experience suggests that when you are dealing with the upper tooth/maxillary facial bones close to your sinus cavities, it's not easy for them to diagnose! You may need to bring this issue up with your dental team, as I just did.
I've several times shared my tooth history with my current dentist yet he still blew my symptoms off last month, until I pressed him for a second opinion. Yesterday, I got an upper tooth root canal retreated by a endodontist, who confirmed they found a pocket of infection above the tip of that tooth. Maybe that's why I've had a stuffy head for months. The CT scan they took for this tooth showed a thickened sinus floor. No doubt, the body tries to fight off a hidden infection. It hadn't gone far enough to be "diagnostic" of a sinus tract, but it was making me ill.
It's just hard to believe this makes 3 dentists over my lifetime who have failed to connect my reported symptoms - saying I felt a bit under the weather, having a stuffy head and post-nasal drip, sore throat, tiredness, etc., to what their images were showing: a dark area, "radiolucent" above the tip of an upper tooth root, which dark area turns out to be bone loss from a significant bacterial infection! Yes, some sinus symptoms can be due to bad teeth, DUH!! I want to take out a billboard ad....
The closest call I had was the day I woke up, after I'd been taking ENT-prescribed antibiotics for a month treating a supposed maxillary sinus infection and noticed my face swollen grotesquely on one side by my nose. I had asked that ENT doctor if my infection source could have been a front tooth apical cyst I'd had surgery to remove 15 years earlier, and was told "that's a different tissue, so it's not the problem." That morning, I took matters into my own hands and called an endodontist myself. I was told to hurry right in and the oral surgeon said that had I not been operated on that day (repeat apicoectomy) I would not have survived, as the infection was about to travel to my brain. (The Ear Nose & Throat doc had also sent me for a CT scan, which showed a cloudy area in the sinus over that front tooth, but it still was diagnosed as a sinus infection. I guess it was, but the cause would not heal until the tooth rooth infection was cured.) A very close call.
So maybe this message is more for those of us with 20-plus year old upper tooth root canals, since things can go wrong over time: get yourselves scanned! You have to ASK for this, it is not part of routine dental cleaning and oral exams. Even bite-wing dental X-rays do not always capture the bone above or below tooth roots (some methods are better at doing this, nowadays).
In 2020, I got a "Panorex" scan, but it was a fuzzy image so it didn't show much. Then this January, I had a digital Cone Beam full mouth scan at my dentist's office, which revealed a pocket above the tooth that got retreated yesterday. At the time, my dentist didn't mention this "halo" or dark spot, as he was so focused on the other side of my mouth he wanted to check to do an implant - on another tooth I'd lost in the same way! (Former dentist had neglected to investigate a suspicious pocket which led to major infection of the palatal bone. I'd gone to our state dental college to try and save that tooth, but it was too late by the time they saw me.)
Yet my current dentist only studied his January Cone Beam scan last week after I made a follow up appointment to push him for another picture of that side of my face; his hygienist last month had asked about a growing gap between two teeth up there, which the dentist thought was no big deal. But afterwards, I started thinking about my history of subtle warning signs that doctors had dismissed, so I called and actually bugged him to take another scan. He pulled up the scan from January, noticed the pocket, said "It might be something, but you should see an Endodontist anyway, because I couldn't treat it if it is an infected root." Sure enough, it was. And he has 180 5-star internet reviews. He has all the state of the art technology. I'm a hard case, I guess....
OK. Hope this saves somebody the misery....