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title: "Dry mouth: What It Means & When to See a GP | HealthAnswers"
description: "Dry mouth (xerostomia) is often caused by medicines, dehydration or mouth breathing; it raises the risk of tooth decay, and persistent cases need a GP…"
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# Dry mouth: What It Means & When to See a GP | HealthAnswers

Symptoms

Dry mouth (xerostomia) is often caused by medicines, dehydration or mouth breathing; it raises the risk of tooth decay, and persistent cases need a GP review.

Written by HealthAnswers editorial team Medically reviewed by [HealthAnswers UK doctor review panel](https://healthanswers.co.uk/our-doctors/) Reviewed 3 July 2026

## Quick answer

What could dry mouth mean? Dry mouth (xerostomia) is often caused by dehydration, mouth breathing, or medicines such as antihistamines and antidepressants. Sipping water and sugar-free gum can help. Persistent dry mouth increases tooth decay risk and may need a GP review to adjust medicines or test for underlying conditions.

General UK health information, not a diagnosis. In an emergency call 999 ; for urgent advice use [NHS 111](https://111.nhs.uk/) (GP out-of-hours in Northern Ireland).

On this page 4 sections

## Common causes of dry mouth

- Many common medicines reduce saliva production and can cause dry mouth.
- Dehydration and breathing through your mouth while sleeping are frequent causes.
- Dry mouth raises risk of tooth decay and oral thrush.
- Sjögren's syndrome and diabetes can cause chronic dry mouth.
- Sipping water regularly and good dental hygiene are important.

## What is dry mouth?

Dry mouth occurs when salivary glands produce insufficient saliva. It can feel sticky, make swallowing and speaking difficult, and alter taste. While often a side effect of medicines or mild dehydration, chronic dry mouth needs attention to protect oral health.

## Common causes of dry mouth

**Dehydration**, **mouth breathing** (often during sleep or with blocked nose), and **medicines** are the most common causes. **Diabetes**, **Sjögren’s syndrome**, radiotherapy to the head and neck, and **[anxiety](https://healthanswers.co.uk/conditions/anxiety/)** can also contribute.

## Managing dry mouth

Sip water regularly, use sugar-free gum or sweets to stimulate saliva, and avoid alcohol and caffeine which worsen dryness. Use fluoride toothpaste, attend dental check-ups, and consider saliva substitutes from a pharmacy.

## When to see a GP about dry mouth

Persistent dry mouth despite hydration, or dry mouth with [dry eyes](https://healthanswers.co.uk/conditions/dry-eyes/) and joint symptoms, should be assessed. If medicines are the likely cause, a GP may adjust treatment — do not stop prescribed medicines without advice.

## ! When to get medical help for dry mouth

See a GP if dry mouth persists despite self-care, or if you have dry eyes, joint pain or a rash alongside it. A GP or pharmacist can also advise on medicine side effects. Call **111** for urgent advice when you are unsure what to do.

## Common questions about dry mouth

Which medicines cause dry mouth? Antihistamines, antidepressants, diuretics, some blood pressure medicines and anticholinergics commonly reduce saliva. Discuss alternatives with a GP if troublesome. Can anxiety cause dry mouth? Stress and anxiety can cause mouth breathing and reduced saliva. Relaxation techniques and addressing underlying anxiety may help alongside hydration. Why does dry mouth increase cavities? Saliva neutralises acids and washes away food — without it, bacteria thrive. Extra dental check-ups, fluoride toothpaste and sugar-free gum help protect teeth. What is Sjögren's syndrome? Sjögren's syndrome is an autoimmune condition that causes dry mouth and dry eyes. Diagnosis involves blood tests and sometimes referral to a specialist.

## Sources

- [NHS — Dry Mouth](https://www.nhs.uk/conditions/dry-mouth)
- [NHS — Tooth Decay](https://www.nhs.uk/conditions/tooth-decay)

## How we reviewed this page

Medically reviewed by the [HealthAnswers UK doctor review panel](https://healthanswers.co.uk/our-doctors/)

First published 28 June 2026 Medically reviewed 3 July 2026 Next review due 3 July 2029 or sooner if NHS or NICE guidance changes

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