7. Keep your gums healthy.
Gum disease, also known as periodontal disease, is a common cause of bad breath. Bacteria accumulate in pockets at the base of teeth, creating bad odors. If you have gum disease, your dentist may recommend a periodontist, who specializes in treating gum disease.
8. Be alert to dry mouth.
Lack of saliva promotes tooth decay and can cause bad breath. If your mouth is dry, drink plenty of water during the day. Chew sugarless gum or suck on sugarless hard candy, which helps stimulate saliva. Use a humidifier at night if the air is dry. If your mouth is still unusually dry, talk to your dentist or doctor. Dry mouth is a side effect of certain medications.
9. See your doctor.
If your bad breath continues despite your best efforts, see your doctor. Bad breath can be a symptom of medical conditions such as a sinus infection, postnasal drip from allergies, lung infections, diabetes, or liver or kidney diseases.