The cheapest gum I find that doesn't cause tummy issues is Stride. I don't buy spree gum because it is more expensive. I chew a packof gum a day (mostly at work sitting in a desk). I use to chew orbit and trident but can only have 1 piece of that gum without causing sugar cravings. Stride doesnt' have maltitol and has less sorbitol than other gums. Stay away from sugar free candy during the day. This will not help with a dry mouth.