This article explains why a dry mouth is bad for teeth.

Why saliva matters

Saliva (spit) keeps the mouth wet, helps digest food, repairs teeth, fights germs and helps you taste. Without enough saliva:

• Food and plaque stick to teeth.
• Bad germs grow.
• Acid from drinks is not washed away. Teeth dissolve and gums get sore.
• You must clean very well, including between teeth.

Causes and what to do

• Not drinking enough water: sip plain tap water often. Drink more when active or sweating. Beer, wine, coffee and energy drinks do not count.
• Dry, dusty work: improve the air or work conditions if you can.
• Caffeine, smoking, alcohol and drugs: cut down.
• Medicines: many cause dry mouth. Ask your doctor to review them.
• Asthma puffers: rinse with water after use.
• Breathing through the mouth: see a specialist about a blocked nose or teeth position.
• Damaged saliva glands (for example Sjögren’s syndrome or radiation treatment): sip water, use dry mouth gels, have less sugar and acid, and use good fluoride products.
• Getting older: saliva goes down. Keep up good dental care.

Use a straw for sugary or acidic drinks.