Bad breath or halitosis as it is called is caused by various reasons. Although the origin of bad breath is primarily the mouth , several health conditions also can be the causes.
- Poor dental hygiene — Infrequent or improper brushing and flossing can leave food particles to decay inside the mouth.
- Infections in the mouth — Periodontal (gum) disease, untreated tooth cavities.
- Respiratory tract infections — Throat infections, sinus infections, lung infections
- External agents — Garlic, onions, coffee, cigarette smoking, chewing tobacco
- Dry mouth (xerostomia) — This can be caused by salivary gland problems, medications or by “mouth breathing.”
- Systemic illnesses — Diabetes, liver disease, kidney disease, lung disease, sinus disease, reflux disease and others
- Psychiatric illness — Some people may perceive that they have bad breath, but it is not noticed by oral-health-care professionals or others. This is referred to as “pseudohalitosis”
Some types of bad breath, such as “morning mouth,” are considered to be fairly normal, and they usually are not health concerns. The “morning mouth” type of bad breath occurs because the saliva that regularly washes away decaying food and odours during the daytime diminishes at night while you sleep. Your mouth becomes dry, and dead cells adhere to your tongue and to the inside of your cheeks. Bacteria use these cells for food and expel compounds that have a foul odour.