Bad breath, also known as halitosis, is commonly linked to oral health issues such as gum disease, tongue bacteria, tooth decay, or poor oral hygiene. However, persistent bad breath is not always caused by the mouth alone. In some cases, it may be a sign of an underlying medical condition.
At Dural Dental Practice, we look beyond the teeth and gums when assessing ongoing halitosis.
ENT Causes
Conditions affecting the ears, nose, and throat can contribute to unpleasant breath odours. Common causes include:
- Chronic sinus infections
- Post-nasal drip
- Tonsillitis or tonsil stones
- Nasal infections
Bacteria and mucus trapped in these areas can produce strong odours that brushing alone will not fix.
Gastrointestinal (GI) Causes
Digestive conditions may also play a role in bad breath, including:
- Acid reflux (GERD)
- Helicobacter pylori infection
- Chronic gastritis
- Poor digestion
Reflux can allow stomach acids and odours to travel upward into the mouth and throat.
Lower Respiratory Causes
Certain lung and airway conditions may produce noticeable odours on the breath, such as:
- Bronchiectasis
- Lung infections
- Pneumonia
- Chronic lung disease
These conditions often require medical assessment rather than dental treatment alone.
Drugs and Habits
Some medications and lifestyle habits can worsen halitosis by reducing saliva flow or introducing odours directly.
Common contributors include:
- Smoking and vaping
- Alcohol
- Dry mouth caused by medications
- Excessive coffee intake
- Crash dieting or fasting
Saliva plays an important role in naturally cleansing the mouth, so reduced saliva often increases odour-causing bacteria.
Metabolic Odours
Occasionally, certain medical conditions can produce distinctive breath smells.
| Odour | Possible Cause |
| Fruity or sweet smell | Diabetes / ketoacidosis |
| Fishy odour | Kidney disease |
| Ammonia-like smell | Renal failure |
| Musty or sweet odour | Liver disease |
When to Seek Help
If bad breath persists despite good oral hygiene, professional assessment is important. A dental examination can help determine whether the cause is oral or if referral to a GP or specialist may be needed.
At Dural Dental Practice, we take a comprehensive approach to halitosis to help identify the cause and guide you toward the right treatment.
