Dry mouth and medicines
Why many medicines cause a dry mouth, why it matters for teeth, and simple ways to ease it.
Written and reviewed by Dr. Rifat Mazhar Falak
Updated 6 October 2026. 3 minute read
A dry mouth is one of the most common problems we see in older adults. It is very often a side effect of medicines, especially when someone takes several medicines every day.
Why it matters
Saliva protects teeth and gums. Without enough of it, people are more likely to get tooth decay, gum disease, mouth infections and sore spots under dentures. A dry mouth can also make chewing, swallowing and speaking uncomfortable.
Common causes
- Medicines for blood pressure, depression, anxiety, allergies, bladder problems and pain
- Some cancer treatments
- Conditions such as diabetes and Sjögren’s syndrome
- Not drinking enough water
Never stop or change a medicine without speaking to the doctor who prescribed it.
Simple things that help
- Sip water often through the day, and keep water by the bed.
- Chew sugar-free gum, or suck sugar-free sweets, to encourage saliva.
- Avoid alcohol-based mouthwashes, and limit caffeine.
- Use a lip balm for dry lips.
- Ask Dr. Rifat about saliva substitutes and high-fluoride toothpaste.
Bring a full list of medicines to your appointment. Dr. Rifat will look at what may be causing the dryness and suggest ways to protect the teeth.
This information is general and not a substitute for an individual consultation. If you are worried about someone's mouth or teeth, please contact us.