Since I've had chronic sinusitis and nasal polyps, I haven't been able
to breathe through my nose so naturally I breathe though my mouth all
the time.  Also since I've had sinusitis, I've noticed that I have had
more cavities and dental problems.  Recently I visited my dentist and
he was telling me when someone breathes through their mouth it dries
up the saliva.   He said that saliva contains good bacteria that helps
protect the teeth and gums from bad bacteria.  He went on to tell me
that cancer patients that receive chemotherapy that affects their
saliva gland will have chronic dry mouth and go on to develop gum
disease and tooth decay.  My dentist tells me once my sinuses are
fixed it will help my teeth and gums, kind of like a domino effect.

Paul