If bad breath persists even after brushing your teeth right after a meal, it could be a sign of a health issue rather than a simple oral problem. Spring's dry conditions are particularly concerning, as reduced moisture in the oral cavity can significantly worsen bad breath. Hong Seong-ok, a professor of oral and maxillofacial surgery at Kyung Hee University Hospital at Gangdong, explains the causes of spring bad breath and proper treatment methods.
Dry spring weather and insufficient water intake reduce the secretion of saliva, the body's natural defense mechanism. Saliva plays a crucial role in washing away bacteria in the mouth, regulating acidity and providing powerful antibacterial action.
"The higher the saliva secretion, the more significantly the concentration of volatile sulfur compounds — the main substances causing bad breath — decreases," Hong said. "Seasonal factors in spring interfere with the mouth's self-cleansing function, creating an environment where halitosis easily develops."
Reduced saliva not only worsens gingivitis and periodontitis but also thickens the tongue coating, a bacterial film on the tongue's surface.
Tongue coating is closely linked to the production of sulfur compounds and ammonia. Spring's weakened immunity and dry conditions boost the activity of filamentous and spiral-shaped microorganisms in the tongue coating, accelerating the generation of odor-causing substances. Dry mouth caused by allergy or cold medications and mouth breathing due to nasal congestion further worsen oral dryness. When these various factors combine, the oral environment deteriorates rapidly, producing far worse bad breath than usual.
Restoring oral health is key
Since more than 80 percent of bad breath originates from causes within the oral cavity, restoring a compromised oral environment is the top priority. Treatment should first address dry mouth so that saliva's self-cleansing function works properly. Rather than simply masking the odor with temporary deodorizers, physically removing tongue coating and dental plaque to normalize the oral ecosystem is essential.
To remove tongue coating, use a tongue cleaner or toothbrush to scrape from the back of the tongue toward the front three to four times. Dental plaque should be thoroughly removed using a toothbrush, dental floss and interdental brushes. Plaque that cannot be removed by brushing alone should be managed through regular dental scaling.
If active periodontal disease is present, root planing beyond routine scaling is needed to thoroughly remove bacterial film lodged deep within periodontal pockets. "In cases of severe periodontitis, it is important to address the root cause of bad breath through antibiotic treatment or surgical intervention when necessary," Hong said. "Long-term reduction in bad breath can only be expected when the bacterial environment in the oral cavity is fundamentally corrected through professional treatment."
Avoid alcohol, caffeine and smoking
Managing dietary and lifestyle habits is also important. Alcohol and caffeine should be limited as they cause diuretic effects and oral dryness. Smoking is another major factor that worsens dry mouth and periodontitis. Acid reflux caused by irregular meals can also trigger bad breath, making regular eating habits necessary. Indoor environment management should not be overlooked either. Use a humidifier to maintain indoor humidity at 40 to 60 percent, and if nasal congestion is present, encourage nasal breathing to prevent oral dryness caused by mouth breathing.
If bad breath persists despite thorough management of oral causes, it is time to consider systemic health issues. Bad breath can be an early signal of gastrointestinal diseases, metabolic abnormalities caused by diabetes, liver dysfunction or anemia — not just a problem in the mouth.
"If bad breath does not improve, coordinated treatment with relevant departments such as internal medicine is important depending on the symptoms," Hong said. "It is advisable to recognize it as a health warning signal from your body and seek professional help."
