<s>[INST] I am suffering from chronic sinus issues have coincided with having a root canal treatment to my upper left 7 tooth.  Ive never suffered bad sinus issues like this before and wondering if perhaps I was allergic to some part of the filling or other, I googled congestion after dental work and found many posts of similar sinus issues after root canals on upper molars.I havent spoken with the dentist as yet as he wasnt in today, but what should I do? [/INST] Hello.read through your query...and I must say that nothing to worried in this.It's just a usual thing that sinus problem starts after undergoing upper tooth root canal.it is because the upper molar tooth roots are in proximity with the sinus floor...this might have resulted in filling material going excess into the sinus(in some cases) or just a reaction due to new material coming near the sinus...u can continue with the antibiotic medication by dentist and do steam inhalation(with picks) for a week.and wait.usually it subsides.if after a week still problem persists meet the dentist and take X-ray and get it treated based on the clinical presentation...be cool and don't panic...hope your benefitted something from this reply...have a healthy day!!! </s>