Why is there always bad breath?

Bad breath is a common unpleasant condition with various underlying causes. Poor oral hygiene is one of the main reasons; dental plaque and tartar promote bacterial growth on tooth surfaces and along the gum line, where bacteria break down food residues and other organic substances in the mouth, producing foul-smelling gases. Digestive system issues such as excessive stomach heat, indigestion, and gastroesophageal reflux disease (GERD) may also contribute to bad breath by impairing normal stomach function and generating odors. In addition, unhealthy lifestyle habits such as smoking, alcohol consumption, and staying up late can disrupt the acid-base balance in the mouth, making it easier for bacteria to proliferate and thereby causing bad breath. To address bad breath, it is recommended to maintain good oral hygiene, avoid unhealthy lifestyle habits, and seek medical advice when necessary to identify any underlying health conditions and receive appropriate treatment.