10902 Dry Mouth Xerostomia

Overview

Dry mouth, also called xerostomia, happens when you do not have enough saliva (spit) to keep your mouth moist. It is a symptom, not a disease itself, and it can be caused by many things. When your mouth is too dry, everyday actions like talking, chewing, swallowing, and tasting can feel difficult or uncomfortable.

Yes. Dry mouth is one of the most common reasons people visit their doctor or dentist. It becomes more likely with age, mainly because older adults are more likely to take multiple medicines.

It can affect anyone, but it is most common in older adults, people taking certain medicines, people who have had radiation therapy to the head or neck, and people with chronic health conditions such as diabetes or Sjogren's syndrome.

Symptoms

Common symptoms

• A sticky, dry feeling in your mouth
• Frequent thirst
• Cracked, dry lips and the corners of your mouth
• Sores in the mouth or a tongue that feels rough
• Difficulty chewing, swallowing, or talking
• A changed sense of taste or a metallic taste
• Bad breath
• More mouth infections, like thrush

Symptoms in children

• A dry, sticky feeling in the mouth
• Cracked or chapped lips
• Bad breath or a white coating on the tongue
• Trouble chewing dry foods or speaking
• Being unusually thirsty or irritable

Symptoms in older adults

• Difficulty eating or swallowing, leading to poor appetite
• Difficulty keeping dentures in place
• Increased tooth decay, gum problems, or mouth infections
• Sore, dry tongue and cracked lips
• Trouble speaking for long periods

Causes

Main causes

• Medicines: many common medicines can cause dry mouth — for example, some used for allergies, blood pressure, depression, anxiety, and pain.
• Dehydration: not drinking enough fluids, or losing fluids through fever, sweating, vomiting, or diarrhoea.
• Breathing through your mouth, especially at night.
• Medical conditions: diabetes, Sjogren's syndrome, autoimmune diseases, anaemia, kidney disease, thyroid conditions, and HIV can cause dry mouth.
• Cancer treatment: radiation therapy to the head or neck can damage salivary glands; some chemotherapy can also cause temporary dry mouth.
• Lifestyle habits: smoking, vaping, chewing tobacco, and drinking alcohol can all dry the mouth.

Risk factors

• Being older than 65
• Taking several medicines every day
• Receiving radiation therapy for head or neck cancer
• Living with a long-term condition like diabetes or Sjogren's syndrome
• Smoking or using tobacco products
• High stress or anxiety

When to see a doctor

See a doctor urgently if:

• You cannot swallow saliva or liquids at all
• You have swelling in your face, jaw, or neck
• You have signs of severe dehydration, such as confusion, fainting, or little or no urine
• Your dry mouth is so severe that it is hard to speak or breathe

Book a routine appointment if:

• Your mouth has felt dry for more than a few days, despite trying fluids and good mouth care
• You have mouth sores that do not heal, changes in your sense of taste, or trouble eating
• You wear dentures that no longer fit or cause sore spots
• You also have dry eyes, dry skin, joint pain, or fatigue — this can be a clue to an underlying condition

Diagnosis

Your doctor or dentist will ask about your symptoms, how long the dry mouth has been happening, and what medicines you take. They will look inside your mouth and check your teeth, gums, and tongue. In many cases, this is enough to find the likely cause.

Tests that may be done

• Blood or urine tests to check for dehydration, diabetes, infection, or autoimmune conditions
• A saliva flow measurement to see how much saliva your glands produce
• Imaging tests, such as ultrasound or a sialogram, if there is a suspected blocked salivary gland or stone
• A small biopsy (sampling a tiny piece of tissue) from a lip or salivary gland if an autoimmune condition like Sjogren's syndrome is suspected

What to expect at your appointment

A dry mouth appointment is usually quick and comfortable. Bring a current list of your medicines and any other symptoms. You will not need to fast or prepare. Your doctor may suggest simple changes first and refer you to a specialist, such as a dentist, oral medicine specialist, or rheumatologist, if the cause is not clear.

Treatment

Treatment depends on what is causing the dry mouth. The most effective plan usually combines self-care, protecting your teeth, treating any underlying condition, and, when needed, saliva substitutes or stimulants.

Self-care at home

• Sip water or plain sugar-free fluids little and often throughout the day
• Chew sugar-free gum or suck sugar-free lozenges to encourage saliva
• Use a room humidifier at night, especially in a dry climate
• Avoid alcohol, caffeine, tobacco, very spicy or acidic foods, and dry snacks like crackers
• Brush twice a day with fluoride toothpaste and floss daily to protect your teeth
• Use alcohol-free mouthwash or rinse with salted water
• Moisten your lips with lip balm and keep your mouth clean after meals

Medical treatments

Your doctor may recommend a saliva substitute — a spray, gel, lozenge, mouthwash, or tablet that mimics natural saliva and helps keep your mouth moist. If medicines are causing your dry mouth, your doctor may review and adjust the prescription — but never stop or change a medicine yourself. If an underlying condition such as diabetes, anaemia, or an autoimmune disease is found, treating that condition can improve dry mouth. In some cases, a doctor may prescribe a medication to help the salivary glands make more saliva.

When is surgery considered?

Surgery is rarely needed for dry mouth. If a blocked salivary gland or a stone is causing the problem, a specialist may remove the blockage. Otherwise, management focuses on relief and protection.

Living with this condition

The goal is to keep your mouth comfortable, your teeth healthy, and your daily life as normal as possible. Carry water with you, keep a drink by your bed, and choose meals that are moist. Tell your dentist and doctor about your dry mouth so they can protect your teeth and review your medicines.

Lifestyle tips

• Carry a refillable water bottle and take small sips throughout the day
• Set a reminder to drink if you forget
• Eat moist foods and add sauces, gravies, or dressings to dry meals
• Keep meals smaller and slower, and enjoy them socially without rushing
• Use alcohol-free oral care products and floss regularly
• Take care of your lips with ointment or balm, especially outdoors

Diet and exercise

Eat a balanced diet with plenty of fluids. Aim for moist, soft foods like soups, stews, yoghurt, smoothies, and cooked vegetables. Limit dry, salty, sugary, and acidic foods, which can make dry mouth worse. During exercise, drink water before, during, and after, because sweat can quickly dehydrate you and reduce saliva.

Mental health and emotional wellbeing

Living with chronic dry mouth can be frustrating and embarrassing. It can affect your confidence in conversations, your pleasure in meals, and your sleep. These feelings are understandable and valid. If dry mouth is affecting your mood or social life, tell your doctor — support is available and many coping strategies can help.

Prevention

Not always, because dry mouth is often caused by medicines or medical conditions. But you can reduce your risk and keep symptoms from getting worse by staying hydrated, protecting your teeth, avoiding tobacco and alcohol, managing stress, and having regular dental check-ups. Reviewing your medicines with your doctor may also help.

Vaccines

There is no vaccine for dry mouth. Getting vaccinated against common illnesses like flu and COVID-19 can help prevent illnesses that cause fever and dehydration, which can make dry mouth worse.

Screening programmes

There is no routine screening test for dry mouth, but regular dental check-ups and periodic reviews of your medicines can help catch problems early. Tell your healthcare team if you notice persistent dryness.

Complications

If left untreated

• Tooth decay and cavities, because saliva normally washes away bacteria and acid
• Gum disease and inflammation
• Mouth infections such as oral thrush
• Difficulty eating, poor appetite, and unintended weight loss
• Problems with dentures, including slipping or sore spots
• Trouble speaking clearly

Long-term outlook

For most people, dry mouth is very treatable. Simple changes, regular sips of water, good mouth care, and the right support can keep symptoms under control. Even when dry mouth is long term, it can usually be managed well, and there are many options to help you feel comfortable and confident. Your doctor and dentist can work with you to find what helps most.

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