Dry mouth
A dry mouth (or xerostomia) is due to decreased saliva flow or changes in the amount of saliva produced. It can be mild or severe and often develops gradually.
Saliva is the body's natural defence against tooth decay. It washes away food debris from around the teeth, neutralises harmful acids produced by plaque, foods and drinks, protects the softs tissue of the mouth and prevents fungal infections. Saliva also acts as a vehicle for minerals such as fluoride, calcium and phosphate, which help strengthen tooth enamel.
Without adequate saliva to lubricate the mouth, wash away food, and neutralise the acids produced by plaque, your teeth are at risk of extensive decay.
Signs and symptoms
If you have a dry mouth, you may experience the following symptoms:
- a sore throat
- dry, tingling or burning sensation of the tongue or mouth
- difficulty swallowing
- thirst
- dry, cracked lips or sores and split skin at the corners of mouth
- bad breath
- hoarseness
- thick, stringy saliva
- dry nasal passages
- problems with speaking, and/or
- oral thrush.
Causes
- Sjoegren's syndrome
- lupus
- diabetes
- Alzheimer's disease
- stroke.
- antidepressants
- antihistamines
- decongestants
- blood pressure medication
- painkillers
- diuretics
Chemotherapy and radiotherapy (especially radiation to the head and neck) can cause a dry mouth.
Saliva flow can also decrease with age.
The following may also contribute to a dry mouth:
- smoking
- drinking alcohol
- snoring
- breathing through your mouth
- drinking caffeinated beverages
- depression
- stress, and/or
- dehydration (e.g. from fever, vomiting, diarrhoea, sport of inadquate fluid intake).
Treatment
Your doctor or dental practitioner will be able to establish and treat the cause of your dry mouth. It may simply be a matter of making changes such as reducing your intake of caffeinated beverages and increasing your intake of water.
To help protect against decay and erosion, a dental practitioner may also recommend use of products such as fluoride mouthwashes, gels or toothpaste with a higher level of fluoride.
To relieve the discomfort of a dry mouth:
- chew sugar-free gum to increase saliva flow
- use saliva substitutes (available from most pharmacies)
- use a small spray bottle (atomiser) to frequently spray water into the mouth, and
- take frequent small sips of water.
You might also like to try the following tips:
- Do not use sugary sweets or drinks to relieve the feeling of a dry mouth. These habits can cause very rapid tooth decay.
- Brush teeth with a soft toothbrush and a low-abrasive, low-foaming fluoride toothpaste, and floss regularly.
- Don't smoke.
- Limit alcohol consumption.
- Limit consumption of caffeinated drinks such as tea, coffee and soft drinks.
- Use gravies and sauces to make food softer and easier to chew and swallow.
- Use a lip balm to soothe and protect dry lips.
- Avoid mouth rinses containing alcohol or peroxide.
Health outcome
A dry mouth can rapidly deteriorate oral health. Consult a dental practitioner for advice.
Help and assistance
For more information:
- contact your dental practitioner
- find your nearest public dental clinic
- call 13 HEALTH (13 43 25 84) for confidential health advice 24 hours a day, 7 days a week
Other resources
- What to do in a dental emergency
- Brushing and flossing