There is a disease called Sjogrens (sp.?) which causes dry mouth & I seem to have it really bad...and then it goes away for awile & then returns. There is a RX called Salagen for that. I have the Rx but it is TERRIBLY expensive ($80.00 for 30 tabs) so I use a spray which I carry in my purse and have one by the bed. It is watery but NOT "water" which helps a LOT & is available in any drug store.