To keep the mouth moist, sip water or other sugar-free fluids often, chew sugar-free gum, and try over-the-counter artificial saliva products. A room humidifier also may help.

See a doctor immediately if:

• Develops suddenly
• Other symptoms that could indicate illness, such as frequent urination or infections

Make an appointment to see a doctor if:

• Persistent
• Trouble chewing, speaking, or swallowing
• Difficulty wearing dentures
• Excessive tooth decay