I was just looking at one of my tooth x-rays, taken at my last dental
appointment. ...Evidently, the bottom of my right maxillary sinus is
sitting right on the root tips of my upper wisdom tooth. ...Is it not
possible that for a stubborn, chronic infection in this area, an
antibiotic would do a lot better job, if it was injected diretly into
this sinus via the mouth?

 ...And also..  What about the frontals? ...Is there any soft area of
bone over lapping them, such that a needle could be pushed through the
exterior skin, to put a dose of antibiotic, or saline solution, directly
into this sinus ?

It strikes me as an exercise in futility to even hope to get a few drops
of liquid into a "closed end" sinus via irrigation, when all you're
doing is sending a 1 minute flow of water, in a half-assed manner past
an opening, which at the best of times, is barely a few millimeters
wide. ...Would it not be better to get the antibiotic or saline solution
directly into the sinuses themselves, and then let this liquid flush the
infected material out?   ....Jon