What causes bad breath?

(1) Let's talk about the most common oral diseases: dental caries, gingivitis, periodontitis, oral mucositis, etc. Bacteria in the oral cavity, especially anaerobic bacteria, decompose food residues and exfoliated epithelial cells in the oral cavity, produce sulfides, emit rotten smells and produce bad breath.

(2) Local factors including sinusitis and tonsillitis can also induce halitosis.

(3) Some diseases of digestive system may also have symptoms of halitosis, such as peptic ulcer, chronic gastritis, functional dyspepsia, gastroesophageal reflux, Helicobacter pylori infection, etc.

(4) Psychological stress is too great. Taking some drugs that lead to saliva reduction, such as some antihypertensive drugs, sedatives, atropine drugs, endocrine disorders, etc., will affect the self-cleaning effect of the mouth, reduce local immunity, and lead to increased bacterial reproduction and bad breath.

(5) Smoking, drinking, drinking coffee, and often eating spicy and irritating foods such as onions, garlic and leeks are also prone to bad breath.

(6) Different diseases can lead to different kinds of bad breath.

For example, diabetics smell like rotten apples, patients with renal failure smell like fish, and patients with liver cirrhosis smell like sulfur.