i had infection of the sinus about 3years ago and through that i developed bad breath, the doctor prescribed Nasonex nasal spray for me and it worked perfectly for the infection but i still bad breath. i have been to the dentist several times and i have been told there's nothing wrong in my mouth and that it is s a result of sinusitis i had few years back. what should i do to prevent this terrible bad breath? should i continue using Nasonex nasal spray?