In TCM (Traditional Chinese Medicine), bad breath is most often a sign of Heat in the body- especially in the Stomach.
Other signs you might experience:
Thirst especially for cold drinks
Gum swelling, pain, bleeding or mouth ulcers
Nausea, vomiting or belching after eating
Stomach discomfort or ache
Dry mouth and lips
Getting proper sleep (ex. eight hours a night or don’t sleep too late)
Eat at regular hours (ex. don’t eat past 7 pm)
Don't over eat or eat too fast
Try adding these to your diet:
Spices such as rosemary and Sage
Avoid these in your diet:
Hot, greasy, fried food (Ex. curry, chilli, garlic/onions, chips etc.)
Caffeine, alcohol, carbonate drinks
Such as Liquorice roots, Peppermint, and Longan Berries to name a few..