Dry mouth: what helps day to day and what matters at your appointment

01 A dry sensation and too little saliva are not exactly the same

The term xerostomia initially describes the subjective feeling of a dry mouth. This does not always coincide with a measurably reduced amount of saliva. “Not drinking enough” is therefore not an adequate explanation in every case. The course of the problem, associated circumstances, an examination and, where necessary, further assessment are what matter. American Dental Association: Xerostomia

It also helps to explain what specifically affects you. Is dryness mainly a problem at night? Do you need a drink to help with eating? Does it interrupt longer conversations? These observations make your symptoms understandable without you having to identify the cause yourself first.

02 What could cause it?

Insufficient fluid intake, breathing through the mouth at night or stress may accompany a dry mouth. Medication and medical conditions are also possible triggers. A link in timing with a new tablet or a changed dose is therefore important information. Please do not stop prescribed medication on your own. NHS: Dry Mouth

Persistent dry mouth is also not an inevitable consequence of ageing. However, people tend to take more medicines as they get older, and these may affect saliva flow. Their role in an individual case can only be assessed in the context of the overall situation. NIDCR: Dry Mouth

Why is the mouth dry at night or in the morning?

Less saliva is produced during sleep. If you also breathe through your mouth, for example because your nose is blocked, you may notice dryness in the morning. Medicines may also contribute. However, the time of day alone does not reveal the cause; note when symptoms occur and which medicines you take to discuss at your appointment. American Dental Association: Xerostomia

03 Three everyday options

1. Keep water to hand. Small sips of water may ease the dry sensation. Sugar-free chewing gum may stimulate saliva flow. Very acidic or sugary sweets are not a good long-term solution. NHS: Dry Mouth

2. Continue careful tooth care. Reduced saliva flow may increase the risk of decay. Regular brushing with fluoride toothpaste therefore remains important. Which additional measures are suitable depends on the findings; they do not replace investigating the cause. American Dental Association: Xerostomia

3. Choose aids carefully. Pharmacies offer moisturising gels or sprays, for example. Not every product suits every situation. Ask for advice, especially if symptoms persist or the lining of your mouth is sensitive. NHS: Dry Mouth

04 What you can bring to the appointment

An up-to-date list of all medicines and over-the-counter products helps with assessment. Information about when the problem started, the time of day and products already tried is also useful. If needed, saliva flow and the oral lining are examined more closely. American Dental Association: Xerostomia

A brief note may be enough: “For about four weeks, mainly at night; I have tried this spray.” There is no need for a detailed diary. What matters is discussing the symptoms rather than simply masking them with ever more products.

When is an examination important?

If your mouth stays dry for weeks, is painful or eating and speaking become difficult, have it assessed. At the dental practice, the teeth, oral lining and saliva are examined. If medicines may be involved or you have other symptoms, such as dry eyes or frequent urination, assessment by your GP is also important. NHS: Dry Mouth

Why reduced saliva can make teeth more vulnerable

Saliva helps wash away food particles. It also contains minerals such as calcium and phosphate that protect tooth enamel and support mineral replacement. When this protective function is reduced, tooth decay and fungal infections in the mouth can develop more easily. Drinking water often eases the sensation but does not replace all the functions of saliva.

Mouth breathing at night can increase dryness, for example with a blocked nose. This does not establish a diagnosis of tooth decay or a specific cause in an individual. It helps to mention whether your nose is often blocked, whether symptoms occur only in the morning or during the day too, and whether medication has recently changed.

For persistent dryness, we discuss oral care and personal tooth-decay risk. Your GP can review medication and possible general causes. Any existing medical advice about fluid intake still applies; do not stop prescribed medication on your own.

NIDCR: saliva, dry mouth and oral health

NHS: dry mouth and mouth breathing at night