Short answer: Dry mouth (xerostomia) is reduced saliva production or a feeling of dryness in the mouth. Its most common cause is regularly used medications; diabetes, Sjögren's syndrome, radiotherapy, fluid loss and mouth breathing can also cause it. When saliva decreases, the risk of cavities and oral thrush increases. Sipping water often, sugar-free gum and fluoride products bring relief; the cause should be investigated by a doctor.
If you notice your tongue sticking to the roof of your mouth in the morning, feel the need to drink water often during the day or find it hard to swallow a dry bite of food, you are not alone. Dry mouth, medically known as xerostomia, is a complaint that is common, especially in middle and older age, but is often overlooked. Yet saliva plays a far more important role than is often thought in protecting the teeth and oral tissues. In this article, we cover the causes of dry mouth, its effects on the teeth, relief methods you can use at home and treatment approaches.
What is dry mouth?
Dry mouth is a feeling of dryness in the mouth or an actual decrease in saliva production; it is not a disease on its own but most often a symptom of another cause. In medicine, the dryness a person feels is called "xerostomia," while measurably reduced activity of the salivary glands is called "salivary gland hypofunction." Although the two are often seen together, they do not always overlap.
When you consider the functions of saliva in the mouth, it becomes easier to understand why a lack of it causes problems:
- It washes away food debris and bacteria.
- It protects the enamel by buffering the acids produced by bacteria.
- It contributes to enamel repair through the calcium and phosphate it contains.
- It makes chewing, swallowing and speaking easier.
- It helps with taste and starts the first stage of digestion.
- It keeps the oral tissues moist and protects them against sores and infections.
Symptoms of dry mouth include a sticky, dry feeling in the mouth, frequent thirst, difficulty swallowing and speaking, cracked lips, sores at the corners of the mouth, a burning tongue, changes in taste and bad breath. In denture wearers, reduced retention of the denture is also a common complaint.
Causes: medications, diabetes, systemic diseases
The most common cause of dry mouth is regularly used medications; this is followed by systemic diseases such as diabetes, radiotherapy to the head and neck area, and lifestyle habits. Often, more than one cause is present at the same time.
Medications
Dry mouth is among the side effects of hundreds of medications. Examples include allergy medications, some antidepressants and anti-anxiety medications, blood pressure medications and diuretics, bladder medications, some pain relievers and muscle relaxants. When more than one medication is used at the same time, the effect can increase. There is an important warning here: no medication should be stopped, or its dose changed, on your own because it causes dry mouth. Talking to the doctor who prescribed the medication allows alternatives to be evaluated if necessary.
Diabetes
Uncontrolled blood sugar can lead to dry mouth along with frequent urination and fluid loss. In people with diabetes, dry mouth can also increase the risk of gum disease and oral thrush. Good blood sugar control helps ease these complaints.
Other systemic diseases and conditions
- Sjögren's syndrome: An autoimmune disease that affects the salivary and tear glands; dry mouth and dry eyes are its main symptoms.
- Head and neck radiotherapy: When the salivary glands are in the radiation field, saliva production can decrease markedly and for a long time.
- Fluid loss: Not drinking enough water, fever, diarrhea and vomiting can cause temporary dryness.
- Mouth breathing and snoring: These cause noticeable dryness, especially in the morning.
- Smoking, alcohol and excessive caffeine: These can dry out the oral tissues and worsen the complaint.
- Stress and anxiety: These can cause a temporary feeling of dryness.
Aging alone does not markedly reduce saliva production. The main reason dry mouth is more common in older age is the increase in the number of medications used during this period.
Effects on the teeth
Because dry mouth reduces the protective effect of saliva, it markedly increases the risk of cavities, gum problems and oral infections. These effects can progress silently; for this reason, regular dental check-ups become even more important for people with dryness complaints.
- Increase in cavities: Fast-progressing cavities can occur, especially at the necks of the teeth and on root surfaces exposed by receding gums.
- Enamel erosion: When acids cannot be buffered, the enamel surface wears away more easily.
- Oral thrush: A dry environment sets the stage for fungal infections to develop.
- Gum problems: Easier buildup of bacterial plaque can promote gum inflammation.
- Fit of dentures and aligners: Dentures hold less well and can cause sore spots on the tissues. People who use clear aligners or night guards may also feel more dryness and irritation under the aligner or guard.
- Bad breath: When the cleansing effect of saliva decreases, odor-causing bacteria can multiply.
How do you relieve dry mouth? Home relief methods
Dry mouth can decrease if the underlying cause can be eliminated; if the cause cannot be removed, simple methods used at home can noticeably ease the complaints. The following recommendations are generally considered safe and beneficial:
- Sip water throughout the day. Carrying a water bottle with you makes it easier to build the habit.
- Chew sugar-free gum or suck on sugar-free lozenges. Products containing xylitol stimulate saliva production without increasing the risk of cavities.
- Avoid sugary and acidic drinks. In a dry mouth, the cavity-causing effect of sugar and acid is more pronounced.
- Limit caffeine and alcohol, and quit smoking.
- Stay away from mouthwashes that contain alcohol. Alcohol can dry out the oral tissues even more.
- Use a humidifier in the bedroom, especially in winter and in rooms with central heating.
- Make a point of breathing through your nose. If you constantly breathe through your mouth, see a doctor to investigate the cause.
- Moisturize your lips and limit dry, salty and spicy foods; moistening meals with sauces and soups makes swallowing easier.
Treatment approaches
Treatment of dry mouth consists of three main steps: identifying the cause, moistening the oral tissues and protecting the teeth against cavities. Cooperation between the dentist and the person's other doctors is important in this process.
- Investigating the cause: Medications used, systemic diseases and habits are asked about in detail. If a disease such as Sjögren's syndrome is suspected, a referral is made to the relevant specialist. For medication-induced dryness, options for changing the dose or the medication can be discussed with the prescribing doctor.
- Saliva substitutes: Artificial saliva products in the form of gels, sprays and rinses temporarily moisten the mouth. Using them at night in particular can make sleep more comfortable.
- Treatments that stimulate saliva production: When the salivary glands still work to some extent, medications that increase saliva production may be considered based on a doctor's evaluation. The suitability and use of these medications are determined only by a doctor.
- Cavity prevention: The dentist may recommend high-fluoride toothpaste, in-office fluoride varnish and more frequent check-ups. Cavities caught early can be treated with small fillings.
- Denture and aligner adjustments: In denture wearers, the fit of the denture is checked; oral thrush is treated if present.
For other frequently asked topics about dry mouth and general oral care recommendations, you can review our frequently asked questions page.
When should you see a doctor for dry mouth?
If the dryness has been going on for several weeks, makes swallowing or speaking difficult, if you notice new cavities in your teeth, or if it is accompanied by other complaints such as dry eyes and joint pain, an examination should not be postponed. At our polyclinic in Çankaya, Ankara, the dental and gum condition of patients with dry mouth is evaluated in detail; a preventive care plan against cavities is created, and when necessary, a referral is made to the relevant doctor.
Frequently asked questions
What disease can dry mouth be a symptom of?
Dry mouth can be associated with diabetes, autoimmune diseases such as Sjögren's syndrome, fluid loss and some neurological conditions. The most common cause, however, is regularly used medications. For long-lasting dryness, it is recommended that the cause be investigated by a doctor.
Why does dry mouth happen at night?
Saliva production naturally decreases during sleep. Mouth breathing, snoring, nasal congestion and dry room air can increase this effect. Humidifying the bedroom and investigating the cause of nasal congestion are often helpful.
Does dry mouth cause cavities?
Yes, because saliva buffers acids and protects the enamel, the risk of cavities increases markedly when saliva production decreases. Fast-progressing cavities can occur, especially at the necks of the teeth and on root surfaces. Fluoride products and regular check-ups help reduce this risk.
Which mouthwash should I use for dry mouth?
Mouthwashes containing alcohol are generally not recommended because they can dry the mouth even more. Alcohol-free products with moisturizing properties can be preferred. It is wisest to ask your dentist which product is right for you.
