Hello there...Its been how long you have your root canal
done? Maxillary sinus
is most commonly effected when the temperature drops down. maxillary sinus is located just above your upper teeth. At times the bone separating the sinus floor and your upper jaw becomes very thin. Otherwise inherently few people have a very thin separation between them. There are nerves that supply your upper teeth. When the sinus is infected or inflamed this irritates the nerve transversing the floor of the sinus and the pain is radiated over your upper teeth. This is when the diagnosis plays an important role. If sinusistis is treated the pain radiating to your upper teeth would subside. We prescribe antibiotics for a period of 5-7 days with anti-inflammatory's for 3-4 days. steam inhalation is advised atleast 3-4 times a day for 15-20 minutes. Consult a Oral and Maxillofacial Surgeon or an ENT specialist
for further evaluation and management.