Body odour (smelling mouth, feet, armpits, etc) can be a sensitive social problem.
Suggestions:
-Proper teeth brushing after meals
-Dental floss
-Tongue brushing/scraping (main cause of bad breath is often the tongue)
-Chewing gum
-Mouthwash (at night since it remains in mouth for longer), Listerine, Dentyl Active Smooth Mint etc
-Hydration/drinking water all the time (dry mouth = bad odour)
-Eat less proteins/meats/garlic/onions
-Stop smoking
-Get a dentist to check on the gums
-Get an ENT doctor to check on the tonsils, nose (post-nasal drip may lead to odour from the nose and mouth)
Set out to correct the world's wrongs and you will most certainly wind up adding to them.