How long does it take for the tooth numbness to go away after endoscopic sinus surgery (FESS)?

Thanks for your question. Did you also have a septoplasty along with the FESS procedure? During a septoplasty, the greater palatine nerves may be affected, and this results in temporary alteration in sensation to the upper teeth. While common, this is often an annoying concern of patients. Fortunately, the sensation usually returns to normal within the first 9 month. If you are beginning to feel some sensation or can detect that your teeth are "waking up", these are good signs. 3 months may be too soon to determine the final improvement. Hopefully, more time to heal will restore the sensation of your teeth to normal. Best Wishes