I have always had a very dry mouth. After complaining about this for awhile, my dentist said that this is caused by a lack of saliva.
For some reason, my mouth doesn't produce as much saliva as most people, and as a result, my mouth stays very dry.
If this isn't treated, it can lead to other problems like gum disease. I use an antibiotic mouthwash every day just like most people use a regular mouthwash.
This really doesn't help me produce any more saliva, it just helps keep my mouth and gums healthy to prevent problems like gum disease.