Gum should be banned in school because the sound of chewing gum can distract other students or it can get in your hair, etc. For example: Today my friend chewed gum during school. But, she didn't get caught. See, this is what I mean, people don't follow rules that teachers give them. I know some people aren't like that, but there's two sides of the story. That is why I think gum should be banned in school.
The sound of gum isn't that loud. If it gets in your hair then you are not real smart. Gum helps kids in school. For some, it helps them think better and concentrate on what they are learning. If chewing gum was allowed in your school then you wouldn't have the issue about your friend not getting in trouble when he or she should have.
Gum should be banned because some kids aren't allowed to have gum. So, kids should just chew outside of school. And if kids are taking tests it can be distracting. Some kids don't like the sound of gum. GUM SHOULD BE BANNED IN SCHOOL. :)