Foul-Smelling Breath: Causes and What It Says About You

Let me be direct: people around you notice foul-smelling breath before you do. And this is not about "poor hygiene" as a verdict. Most often, this odor has a specific cause in the mouth or in the body that can be found and named.

What foul-smelling breath is

The medical term is halitosis. It is not a separate disease but a sign: stale breath that may indicate problems in the oral cavity or internal organs. The mechanism is as follows: normally, aerobic microflora lives in the mouth and keeps anaerobic microflora in check. When the balance shifts, anaerobic bacteria multiply on the dense protein plaque on the tongue, teeth, and inner cheeks and release volatile sulfur compounds. These are what produce that very odor.

Dental causes of a rotten smell

Dental causes include caries and its complications, gum disease, diseases of the oral mucosa, poorly made dentures, and orthodontic appliances. Poor or improper hygiene adds to this: bacteria and food debris decompose right in the mouth. Separately, there is tongue coating: due to elongation of the epithelial papillae, conditions are created there for the multiplication of bacteria and fungi. Problems of the nasopharynx also adjoin the dental causes: chronic runny nose, pharyngitis, tonsillitis, nasal polyps.

Rotten-egg breath: what can cause it

The rotten-egg smell is hydrogen sulfide, one of the volatile sulfur compounds. It is produced by anaerobic microflora, for which protein plaque serves as a nutrient medium. So if the mouth smells of rot or rotten eggs, it makes sense to first look for the source in the oral cavity — plaque, diseased teeth, gums. But there are other possibilities: dry mouth, taking medications that cause dryness, fasting, chronic lung diseases, digestive disorders.

When the smell resembles feces

Fecal breath is also associated with volatile compounds — methyl mercaptan, hydrogen sulfide, skatole. This is not a separate "odor disease" but a signal of microflora imbalance. The causes of the fecal note are the same ones listed above: dental diseases, accumulation of plaque, problems with the nasopharynx, systemic diseases of internal organs, diabetes mellitus, renal failure, oncological diseases, stress, fasting. There can also be an everyday explanation: a person skipped breakfast and lunch, and the odors of partially digested food rise up through the empty esophagus. This is not a pathology.

How a doctor looks for the cause of the odor

The doctor assesses the condition of the teeth, gums, tongue, and plaque, and if tonsillitis is suspected, refers the patient to an otolaryngologist.

When to see a doctor

Go to the dentist if the odor does not go away after several weeks of self-care, if the gums hurt, bleed, or are swollen, if a tooth hurts or an adult tooth is loose, if there are problems with dentures.

Stale breath by itself is not a reason to call an ambulance; 103/112 — for life-threatening conditions, for example, signs of stroke or heart attack.

• The odor persists for weeks even though you brush your teeth and tongue.
• The gums bleed, hurt, or are swollen.
• A tooth hurts or an adult tooth is loose.
• There are problems with dentures or braces.

This is reference material; it does not replace a doctor's consultation — if the rotten smell does not go away, start with a visit to the dentist.

This content is for reference and does not replace a doctor's consultation. Medical disclaimer