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Halitosis and its causes

Halitosis is bad odor of breath
Causes of halitosis are 
Oropharyngeal causes
  • Poor oral hygiene
  • Caries tooth
  • Suppurative lung disease
  • Smoking
  • Food, garlic and fish oil
Hepatocellular failure - Fishy odor of foetor hepaticus.
Azotemia - Ammoniacal or urinary odor
Diabetic ketoacidosis - Sweet or fruity odor