It's a simple message, if you send it, it will never disappear.
The Bismarck School district and the police department are teaching parents about the dangers of sexting.
It's when people send nude pictures of themselves by cell phone.
They say it's prevalent among teens on apps like Snapchat, and there's a misconception that since the photos are only available for a limited time, there's nothing to worry about.
“Have access to your kids' phones and their applications. Check it. You're allowed to, you're a parent, it's your phone. Just ensure it. We're not saying not to trust your kids but have those talks with them and just verify with them just to make sure they're not getting into areas they shouldn't be or that could be dangerous for them,” said Josh Brown, Student Resource Officer.
Police say even parents of elementary school students should be concerned.