My Filling had a small crack and I did not know Upper 3rd tooth from top right side.  It got rotten and filling finally came out.  There was hole there right to the root.  Root is dead as per dentist.  Saying I need Root Canal \"Apt on Thursday\".  Perscribed Clynamicine 150mg 2 tabs 4 times a  day.  My x ray show tooth abcessed into sinus cavity.  My right side maxilliera sinus is hurting extreamly with pressure.  I can breath in through right nostrol but not out nomatter how hard i try.  I did saline flush, Afrine, decongestiants, nothing is working.  Does not seem clynamincine is working i been on it for 3 days with no improvement.
Thanks for your query. I have gone through your query. The infected tooth can be treated with RCT or extraction. The sinus infection can be a separate infection. Consult an endodontist and get the tooth treated. For the sinus infection you need to consult a ENT surgeon and get it treated. If I am your treating doctor, I would had prescribed amoxicillin 500\u00a0mg TID and metronidazole 400\u00a0mg BID rather than clindamycin(if you are not allergic). After completing the course of antibiotics get the tooth and sinus treated. I hope my answer will help you. Take care