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From your description, it is likely that the abscess caused a perforation of your palate bone and the pus is entering your sinus and draining through your nose. If this is the case, you will probably require a minor procedure to repair the hole. I would recommend informing your dentist of this now rather than waiting until the completion of the antibiotics. He may well suggest waiting until the infection is resolved to perform the procedure. But informing him now will allow for better planning and timely treatment.
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