How toothache can cause sinusitis, with knowing the tooth with root canal treatment (upper right first molar)?

Not unusual. The roots of the upper first molar are often very close in proximity to the maxillary sinus. A sinus infection can cause a toothache, and a tooth infection can cause sinus pain. Or the two can occur independently. This tooth is the most common one for a root canal to fail due to its complexity. Seek evaluation by an endodontist, preferably one with 3-d imaging (cbct). Usually treatable.
Tooth\sinus problems. Toothaches do not cause a sinusitis. If you have an infected upper tooth whose root is near the floor of the maxillary sinus, and it has an infection (whether or not it has had root canal therapy), the infection can spread to the sinus causing a sinusitis or sinus infection. A sinusitis or sinus infection can present as a toothache even if nothing is wrong with the tooth.
Complicated but yes. For an upper molar, the tooth roots are often very close or in the sinus separated by only a small amount of bone and membrane (like very thin skin). So a tooth with (or without) a root canal can develop an infection (full of bacteria) and invade the sinus. As the bacteria go untreated, a sinusitis (inflammation, congestion, some discomfort) can develop. Get the tooth fixed and go from there.

Related Questions

I was prescribed Clindamycin (MIP600 capsule) before root canal treatment. With massive toothache can I combine with painkillers and alcohol?

Bad Idea. Ok to take the painkillers - take with at least 700ml water or other non-alcoholic beverage. Skip the alcohol or you might vomit and lose the effect of the meds. Be wise and give it a day or 2 before the alcohol. The root canal is the only thing which is going to solve the problem. Follow the post-op instructions. Best of luck. Read more...
Not recommended. Taking more than the recommended dose of painkillers, or drinking alcohol, significantly raises the risk of serious problems. A tooth pain or tooth decay won't go away without treatment and the infection may spread to your jaw, cheeks, sinus and to other areas of your head and neck. See your dentist ASAP. Read more...

Is laser nerve treatment or pulp capping for toothache better alternative than having a root canal? I do not want a root canal! It is a front tooth

Front tooth. If the nerve is infected, your only alternatives are a root canal or an extraction. Laser treatment is done in conjunction with root canal treatment. Read more...
Root canal is better. Than pulp capping. Pulp capping will only work if there is a pin point exposure of the nerve and it is still healthy. Tooth ache means the nerve is no longer healthy and root canal treatment (with or without use of a laser) is indicated. See a root canal specialist - endodontist. Read more...
No. Your fear and bias against root canals is unfounded! anything other than a root canal in this situation is witchcraft! see an endontist asap. Read more...

I didn't have the advised root canal treatment and now experiencing a painful wobbly tooth. Is it too late to get it done?

Possibly. The internet still cannot replace an exam and radiograph to make a diagnosis. See your dentist for an evaluation to see if you can still restore that tooth. If it is wobbly, then you have bone loss which has compromised its support. Read more...
Maybe. You might have split the tooth. If that is the case, then it cannot be restored and will need to be extracted. If the infection has worsened, this may have caused increased pain and looseness of the tooth. Should this be the case, then it may not be too late. See the specialist -- the endodontist. Good luck. Go today ! Read more...