It is also called bad breath or halitosis. It is possible to have a foul mouth odour and not know it, the sure way is to ask the people around.

Common causes include

1. Tooth decay
2. Tooth cavities
3. Gum infection
4. Poorly kept dentures
5. Smoking, intake of sweets and chocolate
6. Chest or lung infection
7. Sinus infection, recurrent nasal discharge
8. Throat infection: there may be pain during swallowing
9. Excess intake of vitamin supplements
10. Eating of cabbage, garlic, onion
11. Other dangerous causes include diabetes, kidney failure, cancer of the esophagus.

What you can do

1. Get a strong mint to lick
2. Mouth wash may help; do not give mouthwash to children because they may swallow it
3. Rinse your mouth after eating especially after intake of milk, fish, meat, beans
4. Eat fresh fruits and vegetables
5. Proper dental care, regular flossing
6. Brush your teeth twice a day with a toothpaste that has fluoride
7. Visit your doctor/dentist for needed examination and prescription