Bad Breath

Bad breath (halitosis) is caused in roughly 90% of cases by oral bacteria — chiefly on the posterior tongue coating and in periodontal pockets — that metabolize proteins into volatile sulfur compounds. Contributing factors include dry mouth (medication, mouth breathing, dehydration), smoking, certain foods, and infrequent cleaning of dental appliances. Non-oral causes are uncommon but real: chronic sinusitis, tonsil stones, reflux, and rarely metabolic disease. Persistent halitosis despite good oral hygiene warrants dental evaluation first, then medical review for the minority of extra-oral sources. Mouthwash masks odor temporarily; treating the source — tongue biofilm and gum disease — is what works.

• •Noticeable odor on the breath, often worst on waking or after long intervals without eating
• •Coated or furred tongue
• •Bad taste, dry mouth
• •Bleeding gums or loose teeth when gum disease is the driver
• •Postnasal drip or tonsil debris when the source is extra-oral

• •Tongue-coating bacteria producing volatile sulfur compounds (the dominant cause)
• •Gum disease (gingivitis/periodontitis) creating bacterial pockets
• •Dry mouth from medications, mouth breathing, dehydration, or Sjogren's
• •Smoking and tobacco use
• •Less commonly: sinusitis, tonsil stones, reflux, uncontrolled diabetes, liver or kidney disease

The actionable root is oral bacterial load plus the conditions that let it accumulate: inadequate tongue cleaning, untreated gum disease, dry mouth, and tobacco. Fixing the mechanical and salivary environment resolves most cases; chasing systemic causes first misdirects the 90%.