How can i develop more saliva in my mouth?

Supplements/gum: You can get some saliva supplements that can help replace/induce saliva. Most drug stores should have some of these things. Biotene is a common brand name. Just chewing gum can also help induce saliva flow. The best thing is to determine why you have less. Most common is medications but there may be other reasons. Make sure to stay up on fluids as well. See your dentist for consult if needed.

Biotene: Products help reduce dry mouth. Chewing gum or sugar-free candies can promote saliva as well.