Dear Patient, I can understand your concern and feel sorry for the pain you are suffering from. You are informing me that when you got the upper molar extracted, the dentist told you that the bone between the sinus and tooth is destroyed and sinus cavity is open. Roots of upper molar often are found inside the maxillary sinus, which causes opening of the sinus cavity while extraction of the tooth, creating an oro-antral fistula, that is a direct connection between oral cavity and sinus cavity. In this case, the food or water you take has chances of passing infection in the sinus through mouth and the infection does not resolve. It is mandatory to close this connection between mouth and the sinus. It could be done by the dentist by taking stitches in the area when he found that sinus has opened, but it can also be done now. However, as about 2 weeks has passed since extraction, the opening would not be as much clear as it would have been during extraction. A blood clot may have filled the area. So what you need to do now is, go to an oral surgeon or an ENT specialist. I know you have insurance problem, but there seems no other solution to your problem. You might have to go for x-rays and probably CT Scan of the area to diagnose if oro-antral fistula actually exists and if it does, you might have to go for a little surgery to close the communication between mouth and sinus followed by antibiotics to resolve the infection. I hope this information helps. Thank you for choosing HealthCareMagic. I wish you get well soon. Best, Dr. Viraj Shah