The causes of bad breath and  the recommended solutions are the following:

1. Poor oral hygiene. SOLUTION: Brush your teeth twice daily, floss and rinse your mouth with an alcohol-free mouthwash.
2. Foods with strong odors (onions,garlic,etc). SOLUTION: Avoid food with strong odors  or after eating them, drink milk or chew parsley.
3. Dry mouth.SOLUTION: Drink plenty of water, avoid oral rinses with alcohol and chew sugar free gums.
4. Gastroesophageal reflux.SOLUTION: Evaluation and treatment by a gastroenterologist.
5. Low intake of carbonhydrates.SOLUTION: Improvement of daily nutrition.
6. High consumption of alcohol.SOLUTION: Avoid drinking alcohol with an empty stomach and reduce alcohol intake.
7. Smoking.SOLUTION: Regular brushing and flossing of teeth, brushing of the tongue and chewing suger-free gum.
8. Diseases. Individuals who suffer from diabetes, lung disease, kidney disease, liver disease, cancer, respiratory infections or metabolic disorders often experience bad breath due to dry mouth.SOLUTION: Follow instructions for dry mouth.
9. Medications (including antihistamines – antidepressants)  can cause dry mouth can cause bad breath.SOLUTION: Follow instructions for dry mouth.
10. Mouth infections (cavities, gum disease, or impacted teeth). SOLUTION: Dental consultation.