Just the simplest of tips, chew gum. The flavor of the gum, makes the formation of saliva to wet your mouth. The eustation tubes go from your mouth to your ears to eqaulize presure when you rapidly change altitudes. With the weakening of my right side, my eustation tube is also not working as well. The best is sugar free, enough other things have sugar in them so you do not need anymore. If you don't burn up the sugar immediately, it gets stored in your fat cells.