Why cant you chew gum in the school?

Well, to put it in a simple answer, most teachers do not like gum on the floors, desks, etc.

Gum is gross to touch accidentally underneath a desk (Which I'm sure everyone has had that awful feeling at some point), and if gum is stuck on the floor, it can be a very painful experience to try and get it off.

But, I have read in some places that Chewing Gum helps you remember, helps in math, even helps your heart.