Normally, exhaled air from humans has a humidity of about 95% and is slightly cooler than the temperature in the oral cavity. It contains about 78% nitrogen, 17% oxygen, 4% carbon dioxide and about 1% other gases.
However, this one percent may contain highly odour-active volatile compounds, which means that despite the low volume fraction, the smell of the exhaled air is perceived as unpleasant or even unbearable. This phenomenon is popularly referred to as bad breath.
Alongside volatile sulphur compounds (for example methyl mercaptan, dimethyl sulphide or hydrogen sulphide), the most important significant compounds in this context are odour-intensive substances such as indole, skatol, carbadorine or putrescine. The day-to-day odour of the exhaled air is often subject to significant fluctuations, which correlate with factors such as time of day and food intake.
Individual advice on halitosis can be obtained in a halitosis consultation with us at the practice.