Dry Mouth (Xerostomia): Causes and Treatment (2026)

• Constant need to drink water
• Dry lips and tongue on waking
• Sticky feeling in the saliva
• Difficulty speaking or swallowing
• Altered taste
• Burning tongue (burning mouth syndrome)
• Bad breath
• Frequent decay
• Cracks at the corners of the mouth (angular cheilitis)

1. Medication Side Effects (the most common — over 40%)

More than 500 medications cause dry mouth. The most frequent culprits are:

• Antidepressants (SSRIs, tricyclics) — via the serotonin effect
• Antihistamines (allergy medications) — Claritin, Zyrtec
• Diuretics — for hypertension
• Antihypertensives (beta-blockers, ACE inhibitors)
• Anticholinergics (for urinary incontinence, IBS)
• Opioid analgesics
• Muscle relaxants
• Antipsychotics
• Chemotherapy agents

Solution: Dose adjustment or an alternative under your doctor's supervision. Never stop medication on your own!

2. Sjögren's Syndrome

An autoimmune condition in which the immune system attacks the salivary and tear glands.

Symptoms:

• Severe dry mouth
• Dry eyes (reduced tear production)
• Joint pain
• Fatigue
• Dry skin

Diagnosis: Blood tests (SSA-Ro, SSB-La antibodies), salivary-gland biopsy, eye tests.

Treatment: Rheumatology follow-up plus artificial saliva and stimulants such as pilocarpine.

3. Radiotherapy (Head and Neck)

Radiotherapy for head and neck cancer causes permanent damage to the salivary glands. Most patients experience significant xerostomia afterwards.

Prevention: IMRT (intensity-modulated radiotherapy) can spare the glands.

4. Ageing

Salivary-gland function declines after age 65. Older patients also take more medications — the two factors compound.

5. Uncontrolled Diabetes

High blood sugar causes osmotic diuresis — the body loses fluid. Diabetes also directly impairs salivary-gland function.

Solution: Blood-sugar control. Dry mouth, bad breath and frequent decay are common in people with diabetes.

6. Mouth Breathing (Sleep Apnoea)

Breathing through the mouth during sleep causes dry mouth that is most pronounced on waking.

Causes:

• Nasal obstruction (deviation, sinusitis, polyps)
• Sleep apnoea (untreated CPAP)
• Enlarged tonsils / adenoids (in children)

Solution: ENT review, and polysomnography if needed.

7. Stress and Anxiety

Acute stress reduces saliva flow — the "dry-mouth" feeling when speaking is common. Chronic stress can lead to chronic xerostomia.

8. Smoking and Alcohol

Smoking suppresses salivary-gland function. Alcohol causes dehydration and mucosal irritation. Together, particularly in the evening, they produce severe morning dry mouth.

9. Dehydration

Insufficient water intake is the simplest cause, especially in:

• Heavy caffeine or alcohol users
• Those doing intensive exercise
• People drinking little water in hot weather

10. Salivary-Gland Disorders

• Sialadenitis (inflammation of a salivary gland)
• Salivary stones (duct obstruction)
• Salivary-gland tumours (rare)

These typically present with one-sided swelling and pain.

Saliva is the mouth's natural defence. Without it:

• Decay risk increases 10-fold — saliva remineralises enamel with fluoride, calcium and phosphate
• Gum disease accelerates — bacterial control is lost
• Bad breath — VSC production rises
• Mucosal ulcers — the protective film is gone
• Dentures stop fitting well — saliva acts as an adhesive
• Altered taste — saliva dissolves taste molecules

Immediate Relief

• Sip water frequently throughout the day
• Sugar-free gum — carry a pack with you
• Sugar-free lozenges (with xylitol)
• Moisturising sprays (Biotène, Xerostom)
• Artificial saliva (from the pharmacy)

Long Term

• 2–3 litres of water a day
• Cut caffeine and alcohol
• Stop smoking
• Use a room humidifier (particularly in the bedroom at night)
• Avoid alcohol-based mouthrinses
• Fluoride toothpaste (critical for decay prevention)
• Two or three dental check-ups a year (for xerostomia patients)

What to Avoid

• ❌ Constant menthol lozenges (increase dryness)
• ❌ Alcohol-based mouthrinses (Scope, Listerine)
• ❌ Very sugary drinks
• ❌ Very acidic drinks
• ❌ Smoking

1. Artificial Saliva

Available as a spray, gel or lozenge from pharmacies. The effect is short-lived (30–60 minutes) — temporary relief only.

2. Saliva-Stimulating Medication

• Pilocarpine (Salagen) — prescription only
• Cevimeline — approved for Sjögren's syndrome

3. Acupuncture

Some studies have shown an increase in saliva flow.

4. Treating the Underlying Condition

• Diabetes control
• Rheumatology input for Sjögren's
• Medication change

Patients with xerostomia need tailored protection:

Daily:

• Fluoride toothpaste (1450–5000 ppm)
• Fluoride mouthrinse
• Flossing

Every 3 months:

• Dental check-up
• Fluoride application (gel or varnish)
• Scale and polish

As needed:

• Prescription-strength toothpaste
• Fissure sealants (particularly in children)
• Chlorhexidine (short-term antibacterial)

For more on oral health:

• Bad Breath Causes and Treatment — Causes of odour
• Preventing Tooth Decay — Preventing decay in dry mouth
• Proper Tooth Brushing Techniques
• Dental Scaling and Cleaning
• Bleeding Gums Causes — A related symptom

1. Fox PC. Xerostomia: recognition and management. Dent Assist. 2008;77(5):18-48. PubMed
2. Turner MD. Hyposalivation and Xerostomia: Etiology, Complications, and Medical Management. Dent Clin North Am. 2016;60(2):435-443. PubMed
3. Tanasiewicz M, Hildebrandt T, Obersztyn I. Xerostomia of Various Etiologies: A Review of the Literature. Adv Clin Exp Med. 2016;25(1):199-206. PubMed

Do you have chronic dry mouth? At Derya Dental Clinic in Maltepe we offer a thorough assessment, risk analysis and a tailored preventive protocol. If diabetes, Sjögren's or a medication cause is suspected, we will refer you to the appropriate specialist.

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This content is for informational purposes only and does not replace medical diagnosis or treatment. Please consult a specialist for decisions about your oral and dental health.