Dry mouth is about having too little saliva to keep your mouth moist. Without moisture it may be hard to eat, swallow, taste food and speak. Saliva protects your mouth by washing away food particles, kills bacteria, neutralizes many acids that cause tooth decay, and moistens your mouth, nose and throat.
Many medications and some cancer treatments and conditions can cause a dry mouth. Even over the counter medications can cause a dry mouth. If you have a dry mouth you may want to avoid: candy, cough drops, drinks with a high sugar content, drinks with caffeine or alcohol, carbonated and citrus flavored drinks and even diet sodas. Your physician or dentist may advise you to drink extra water, protect your teeth with a fluoride toothpaste, rinse or varnish, use a saliva substitute and use a humidifier at night.