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Health condition · Clinically reviewed

Dry mouth, the medications behind it, and how to protect your teeth.

Xerostomia is common, treatable and almost always has a driver worth finding. A stepped medical, dental and, when needed, rheumatology approach beats endless sipping.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE, BSDH, BSOM and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice including medication rationalisation, saliva substitutes and Sjögren pathways.

Key facts

Dry mouth at a glance.

The essentials, in plain English. What xerostomia is, why it matters, and how it is treated in the UK today.

  • What it is

    Xerostomia is the subjective sensation of a dry mouth, often but not always with objectively reduced saliva (hyposalivation).

  • How common

    Up to 30 per cent of adults over 65 report dry mouth. Prevalence rises steeply with age and polypharmacy.

  • Biggest driver

    Medication is the leading cause. More than 500 drugs are implicated, from antidepressants to antihistamines.

  • Autoimmune cause

    Sjögren syndrome destroys salivary and lacrimal glands. It often pairs with dry eyes, fatigue and joint pain.

  • Why it matters

    Untreated dry mouth accelerates dental caries, gum disease, oral thrush, halitosis and denture problems.

  • Foundation of care

    Review medications first, then hydration, saliva substitutes and stimulants, plus preventive dental care.

Why this guide matters

Find the cause, then treat the mouth.

Dry mouth is rarely random. The three points below shape the rest of this page and the plan your GP or dentist will follow.

  • Medication first

    More than 500 drugs cause dry mouth. Reviewing and rationalising them is nearly always the biggest single win.

  • Think about Sjögren

    Dry mouth with dry eyes, fatigue or joint pain deserves a Sjögren workup. Diagnosis changes treatment.

  • Protect the teeth relentlessly

    A dry mouth is a caries mouth. High-fluoride toothpaste, professional prevention and regular review are non-negotiable.

How the diagnosis is made

From first sip of water to a clear plan.

The steps a UK GP, dentist or oral medicine specialist will normally follow, in order, so you know what to expect and why.

  1. 01

    Assessing

    Focused history

    How long, how bad, at night or with meals, difficulty swallowing dry food, dry eyes, fatigue, joint pain and mouth breathing.

  2. 02

    Assessing

    Medication review

    A line-by-line look at every drug you take, prescribed or over the counter, to find the ones drying you out.

  3. 03

    Assessing

    Oral examination

    Salivary glands (parotid, submandibular, sublingual), tongue, mucosa, teeth and dentures. Milking the ducts to see if saliva flows.

  4. 04

    Confirming

    Sialometry

    Measuring unstimulated and stimulated salivary flow in a specialist oral medicine clinic to confirm hyposalivation.

  5. 05

    Confirming

    Sjögren workup

    Anti-Ro and anti-La antibodies, ANA, rheumatoid factor, ESR and immunoglobulins, alongside dry-eye testing.

  6. 06

    Confirming

    Imaging and biopsy

    Salivary gland ultrasound is first-line. Sialography, MRI or a labial minor salivary gland biopsy come in for tricky cases.

  7. 07

    Preparing

    Systemic bloods

    Thyroid function, glucose or HbA1c, HIV and hepatitis C where clinically indicated, to catch treatable systemic drivers.

Typical timeline: from first consultation to a working plan in weeks, not months.

Symptoms

What dry mouth actually feels like.

Beyond the constant sipping, dry mouth changes taste, sleep, dental health and confidence. Here is the pattern to look for.

  • Sticky, cotton-wool mouth

    A constant sense of dryness, especially on waking or after speaking for a while. Water helps only briefly.

  • Difficulty swallowing dry food

    Toast, biscuits and rice feel like they get stuck. Meals become slow and you sip water constantly.

  • Altered taste

    Food tastes bland, metallic or salty. Dysgeusia is common when saliva production drops.

  • Cracked lips and sore tongue

    A red, fissured tongue, angular cheilitis at the corners of the mouth and painful mucosa.

  • Dental decay and gum disease

    New cavities, particularly at the necks of the teeth (root caries), and bleeding, receding gums.

  • Oral thrush

    White plaques that rub off or a red, sore tongue and palate. Denture wearers are particularly prone.

  • Halitosis and denture problems

    Persistent bad breath, dentures that no longer sit well and ulcers from friction on dry mucosa.

  • Red flag - dry eyes with fatigue

    Dry mouth plus dry eyes, fatigue or joint pain points to Sjögren syndrome and needs rheumatology review.

Treatment

How dry mouth is treated in the UK.

Rationalise the drugs, moisten the mouth, stimulate what saliva remains, protect the teeth, treat the cause. In that order.

  • Medication rationalisation

    The single most effective step. Review, deprescribe or swap the drugs driving the dryness with your GP or pharmacist.

  • Hydration and habits

    Frequent sips of water, ice chips, a bedside humidifier, and avoiding alcohol, caffeine, smoking and alcohol-based mouthwashes.

  • Saliva substitutes

    Biotène, Bioxtra, Xerostom, Salivix and Glandosane as sprays, gels and rinses. Used as often as symptoms need.

  • Saliva stimulants

    Sugar-free chewing gum, xylitol sweets and short courses of citric acid preparations to coax residual glands into working.

  • Pilocarpine (Salagen)

    A muscarinic agonist that stimulates any remaining salivary tissue. Used in Sjögren and post-radiotherapy dry mouth, with careful screening.

  • Preventive dental care

    High-fluoride toothpaste (Colgate Duraphat 5000 ppm), interdental cleaning, regular fluoride varnish and three-monthly dental review.

  • Antifungal treatment

    Nystatin suspension, miconazole gel or fluconazole capsules for candidiasis. Denture hygiene reviewed alongside.

  • Treat the underlying disease

    Hydroxychloroquine and, in selected patients, rituximab for Sjögren. Specialist head-and-neck follow-up after radiotherapy.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP, dentist or specialist knows your history and can tell you which parts apply to you. If in doubt, get seen.

  • NICE CKS. Xerostomia (dry mouth) - management.

  • British Society for Oral Medicine (BSOM). Xerostomia guidance.

  • British Society for Disability and Oral Health (BSDH). Dry mouth in older adults and end-of-life care.

  • British Society for Rheumatology. Guideline for the management of adults with primary Sjögren syndrome.

  • Royal College of Surgeons of England / Faculty of Dental Surgery. Clinical guidelines for dental prevention.

Red flags

When dry mouth needs urgent attention.

Most dry mouth is manageable in primary care and general dental practice. These situations are not, and they deserve a specialist opinion.

  • Sudden painful gland swelling

    Rapid, tender enlargement of a parotid or submandibular gland suggests sialadenitis or a stone and needs same-day review.

  • Persistent unilateral gland lump

    A firm, one-sided salivary gland mass that lasts more than three weeks warrants an urgent head-and-neck referral to exclude tumour.

  • Dry mouth plus dry eyes

    The combination raises the possibility of Sjögren syndrome. Ask the GP for antibody testing and rheumatology input.

  • New numbness or facial weakness

    Facial nerve involvement alongside gland disease is a red flag for a malignant salivary tumour.

  • Rampant new cavities

    A sudden burst of decay, particularly root caries, means the mouth environment has changed and prevention needs urgent escalation.

  • Recurrent oral thrush

    Repeated candidiasis in a dry mouth may signal poorly controlled diabetes, HIV or immunosuppression - worth screening.

  • Weight loss and fatigue

    Dry mouth with unintentional weight loss, night sweats or lymph-node swelling deserves a broader systemic workup.

  • Post-radiotherapy neck

    Severe, disabling dryness after head-and-neck radiotherapy is a specialist problem. Ask for oral medicine or head-and-neck follow-up.

  • Suspected medication cause

    A new dry mouth soon after starting a drug is almost always the drug. Do not stop it on your own - review it with the prescriber.

Living with it

A treatable condition, with a clear ladder.

Four things that make the biggest daily difference. Steady hydration, dental protection, cutting the dryers and knowing when to step up.

A quiet reminder

Consistency beats intensity, every time.

Small, steady habits kept up for months do more for a dry mouth than a heroic week that does not last.

  1. 01 Sip

    Water within reach, always

    Small, frequent sips beat large gulps. Keep a bottle by the bed, on your desk and in the car.

  2. 02 Protect

    Protect your teeth

    High-fluoride toothpaste, interdental brushes and a dental check every three to six months. Prevention is far cheaper than fillings.

  3. 03 Avoid

    Cut the dryers

    Alcohol-based mouthwashes, smoking, vaping, caffeine and alcohol all make dry mouth worse. Try SLS-free toothpaste.

  4. 04 Escalate

    Do not settle for suffering

    If saliva substitutes are not enough, ask about pilocarpine or specialist oral medicine review. There is more that can be done.

Frequently asked

Everything we get asked about dry mouth.

Quick answers on causes, medications, Sjögren, saliva substitutes and how to protect your teeth.

  • What causes dry mouth?

    Most often medication. More than 500 drugs can reduce saliva, including antidepressants, antihistamines, antipsychotics, diuretics, opioids and antimuscarinics. Other causes include Sjögren syndrome, radiotherapy to the head and neck, diabetes, dehydration, mouth breathing and anxiety.

  • Is dry mouth just uncomfortable, or is it serious?

    It is both. Beyond the discomfort, saliva protects your teeth and mucosa. Chronic dry mouth accelerates dental decay and gum disease, drives oral thrush, causes halitosis and can make swallowing, speaking and wearing dentures difficult.

  • Could my medication be the cause?

    Very possibly. If the dryness started within weeks of a new prescription, or worsened when a dose went up, ask your GP or pharmacist for a full review. Many drugs have less-drying alternatives, and sometimes the dose can simply come down.

  • What is Sjögren syndrome?

    Sjögren is an autoimmune condition where the immune system attacks the glands that make saliva and tears. It causes dry mouth, dry eyes, fatigue and joint pain, and often overlaps with other autoimmune diseases. Diagnosis is confirmed with blood tests and sometimes a small lip gland biopsy.

  • Do saliva substitutes and stimulants really help?

    Yes. Sprays, gels and rinses such as Biotène and Bioxtra give short-term relief, and sugar-free chewing gum with xylitol stimulates any working glands. For more severe cases, prescription pilocarpine can meaningfully increase saliva.

  • How do I protect my teeth if I have dry mouth?

    Use a high-fluoride toothpaste (your dentist can prescribe Duraphat 5000 ppm), clean between your teeth daily, cut back on sugar and acidic drinks, and see your dentist regularly for fluoride varnish and preventive advice. Do not wait for pain to book an appointment.

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