As a veterinarian, i will share with you that Xylitol is Very toxic for dogs. It can kill them with hypoglycemia or liver failure so keep gum and anything containing xylitol out of their reach. I also have cut back sugar and found that it becomes easier with time. I am 5 years out form my H&N cancer treatment and still trying to regain my weight. I also find that my hydration status makes a big difference in mouth dryness. Drink LOTS of water, especially in the evening before bed. Up to use the bathroom is better than that horrible dry sticky mouth. Best of luck to you.