Some of these things could end up being a service to young people, if only someone would just tell them. Joe Raedle/Getty Images To maintain order in the classroom — and to keep their jobs — there are some things teachers just can't tell their students, even if they want to.

But some of these things, while perhaps controversial, could end up being a service to young people, if only someone would just tell them.

So we asked teachers everywhere to weigh in on the one thing they'd love to tell their students but can't, and more than 50 teachers shared their insights.

We've (anonymously) included some of the most constructive thoughts here: