Why Does Bubble Gum Get Hard When Chewed With Cold-water?

Season's Greetings!
Have you ever experienced a frozen-gum situation? You might be chewing that lovely gum of yours and then you feel a little thirsty and then the gum suddenly gets hard and less flexible just because you had a glass of cold water. Did it seem weird? Or did you ignore it?
Doesn't matter anyway, I've got a perfect explanation for you.

What is bubble gum made of?
Most bubble gum have basic ingredients; GUM BASE,sweeteners, softeners and flavorings.
I purposely made 'GUM BASE' appear in an upper case because its kinda the big deal.
Gum Base.
You can consider gum base to be a kind of rubber. This rubber is sensitive to temperature, that is, it stiffens or becomes hard when exposed to room temperature and below but the opposite when exposed to body temperature and above.
Now, when you take cold water, which apparently happen to be below room temperature, the bubble gum responds by becoming less flexible and hard. This also happen when you take water that is at room temperature.

Why Doesn't Saliva Make The Gum Hard?
You might wonder- if gum becomes stiff when you drink water, why doesn't our saliva do the same magic.
Well, the saliva contains less water, besides, the saliva takes the temperature of the body, which is above room temperature.
Stay tuned...