How do I get rid of the smell around my crown? The doctor concluded that I had gingivitis. (Photo)

I went for a dental checkup and the doctor concluded that I had gingivitis, and around my dental crown, my top left molar, I had a pocket of 5 mm, with bone loss around a half a mm to a mm. There is a foul smell around my crown, and the dentist gave me some kind of medicine under my gums to heal them. I had another dentist look at my crown and he said that it was completely solid, with no signs of decay or the cement being loosened, or no points of entry, so he ruled out the crown as being the smell.