Bad breath is manifested by bad smelling breath. Often this is not noticed by the affected person, but by those around them.
Bad breath that lasts a few hours comes from certain foods such as onion or garlic. This can be easily alleviated with increased oral hygiene.
Pathological bad breath, on the other hand, is a permanent burden (halitosis, foetor ex ore).
Bacteria that proliferate in the mouth and throat also release more sulphurous gases and fatty acids when decomposing food residues. This leads to a pronounced foul odor.
Sometimes the cause can be attributed to the smell. Acidic bad breath, for example, is characteristic of a disease of the stomach, while acetone odor is characteristic of prolonged fasting and poorly controlled diabetes.
Bad breath is also typical for smokers.