Understanding Bad Breath (Halitosis): Causes, Prevention, and Solutions

Halitosis (bad breath) affects 25–50% of adults. 90% originates in the oral cavity; 10% from ENT, pulmonary, GI, or systemic sources.

Oral Causes (Most Common)

• Poor hygiene: Plaque, food debris → bacterial putrefaction (volatile sulfur compounds/VSCs).
• Periodontal disease: Deep pockets harbor anaerobes.
• Tongue coating: Posterior dorsum = major VSC factory.
• Xerostomia (dry mouth): Medications (anticholinergics), Sjögren's, mouth breathing, CPAP; reduced salivary clearance.
• Dental issues: Caries, faulty restorations, food traps.
• Dentures: Overnight wear, inadequate cleaning.

Extraoral Causes

• Tonsilloliths, chronic sinusitis, post-nasal drip
• GERD (acid/pepsin), H. pylori
• Respiratory infections, bronchiectasis
• Metabolic: diabetic ketoacidosis (fruity), uremia (ammonia), liver failure (fetor hepaticus)
• Medications: nitrates, chemotherapy, some psychotropics

Dietary and Lifestyle Factors

• Garlic, onions, cruciferous vegetables (sulfur compounds)
• Coffee, alcohol (drying)
• Tobacco (smoker's breath, gum disease)
• Fasting/ketosis (acetone breath)

Management

1. Oral hygiene: brush 2×, floss 1×, tongue scrape (critical).
2. Hydration; sugar-free gum (xylitol) stimulates saliva.
3. Chlorhexidine or CPC mouthwash short-term; zinc/chlorine dioxide rinses for VSC neutralization.
4. Treat periodontal disease; regular dental cleanings.
5. Address dry mouth: sips water, saliva substitutes, medication review.
6. Medical evaluation if oral causes excluded.

Halitosis is treatable. Start with the tongue.