question: I have a bad smell on tooth #7 in back. My tongue automatically goes there to want to suck it out.  I had a root canal in January.  My dentist took anither X-ray and says there is a small area that my stil be infected because it shows up dark area.  There oral surgeon who did the root canal says it will heal in tme.  my gums are not swollen.  But when I push down my that tooth iit seems like it leaks.  I have a bridge from #6 through 11.