Bone graft on infected teeth - how to tell if my infection went away?

I had a 6-year chronic infection of 2 upper root canal molars (retreated) that radiated to my sinus and i was getting sinus pressure and congestion at night and in the mornings. Last week the dentist extracted both, took out a big cystic lesion and put bone graft. Its been almost a week and although i am healing quickly, my sinus did not improve and i have slightest dull pain on that side. Is there chance the infection is still present?