Morning time – Saliva flow almost stops during sleep and its reduced cleansing action allows bacteria to grow, causing bad breath.
Certain foods – Garlic, onions, etc. Foods containing odour-causing compounds enter the bloodstream; they are transferred to the lungs, where they are exhaled.
Poor oral hygiene habits – Food particles remaining in the mouth promote bacterial growth.
Periodontal (gum) disease – Colonies of bacteria and food debris residing under inflamed gums.
Dental cavities and improperly fitted dental appliances – May also contribute to bad breath.
Dry mouth (Xerostomia) – May be caused by certain medications, salivary gland problems, or continuous mouth breathing.
Tobacco products – Dry the mouth, causing bad breath.
Dieting – Certain chemicals called ketones are released in the breath as the body burns fat.
Dehydration, hunger, and missed meals – Drinking water and chewing food increases saliva flow and washes bacteria away.
Certain medical conditions and illnesses – Diabetes, liver and kidney problems, chronic sinus infections, bronchitis, and pneumonia are several conditions that may contribute to bad breath.
Keeping a record of what you eat may help identify the cause of bad breath. Also, review your current medications, recent surgeries, or illnesses with your dentist.