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Bad Breath (Halitosis): Prevalence, Causes, and Management

Halitosis: More Common Than You Think

Approximately 50% of adults experience halitosis at some point, with 25% having chronic bad breath. It's the third most common reason for dental visits after caries and periodontal disease.

Primary Causes

Oral Sources (~85–90% of cases)

  • Tongue coating: Posterior dorsum harbors anaerobic bacteria producing volatile sulfur compounds (VSCs: hydrogen sulfide, methyl mercaptan).
  • Periodontal disease: Deep pockets trap bacteria and debris.
  • Poor oral hygiene: Plaque, food impaction, unclean dentures.
  • Xerostomia (dry mouth): Reduced salivary clearance (medications, Sjögren's, mouth breathing).
  • Dental caries, abscesses, pericoronitis.

Extraoral Sources

  • ENT: Chronic sinusitis, postnasal drip, tonsilloliths (tonsil stones).
  • GI: GERD, H. pylori, Zenker's diverticulum (rare).
  • Systemic: Diabetic ketoacidosis (fruity), uremia (ammonia), liver failure (fetor hepaticus), trimethylaminuria (fishy).

Diagnosis

  • Organoleptic assessment (gold standard).
  • Halimeter (VSC measurement).
  • BANA test, gas chromatography (research).

Management

  1. Tongue cleaning: Daily mechanical scraping reduces VSCs by 40–75%.
  2. Oral hygiene: Brushing 2x/day, interdental cleaning, professional cleanings.
  3. Treat periodontal disease.
  4. Hydration and saliva stimulation: Water, sugar-free gum (xylitol), salivary substitutes.
  5. Antimicrobial mouthrinses: Chlorhexidine 0.12% (short-term), cetylpyridinium chloride, zinc-containing rinses.
  6. Address extraoral causes: ENT referral, GERD management.

When to See a Professional

Persistent halitosis despite good oral hygiene warrants dental evaluation to rule out periodontal disease, then medical referral if oral causes excluded.

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