Oral Medicine & Pathology
Dry mouth (xerostomia)
When you do not make enough saliva, and why it matters for your teeth.
Cause
Medicines, conditions
Main risk
Tooth decay
Relief
Sip water often
Help
Tell your dentist
Overview
Dry mouth, or xerostomia, happens when you do not make enough saliva. Saliva protects your teeth and gums, so a dry mouth can raise the risk of decay, gum problems and bad breath.
Common causes include certain medicines, some health conditions and dehydration. There are several ways to keep your mouth more comfortable and protect your teeth.
What to know
- Saliva protects teeth, so dryness raises decay risk
- Often linked to medicines or health conditions
- Sipping water often helps comfort
- Sugar-free gum can encourage saliva
- Tell us so we can help protect your teeth
Common questions
Why does dry mouth matter?
Saliva protects teeth, so without it decay and gum problems are more likely.
What causes it?
Many medicines, some health conditions, and not drinking enough fluids.
How can I ease it?
Sip water often, try sugar-free gum, and limit caffeine and alcohol.
Should I change my medicines?
Never stop a medicine yourself. Talk to your doctor or pharmacist first.
How can the dentist help?
We can suggest products and extra protection, like fluoride, for your teeth.
Related topics
Dr Rick Iskandar · Reviewed June 2026