Often anger encourages teenagers to further ignore or dismiss what you are saying to them. By remaining calm, you can state your case in a clear and concise way, leaving them with little reason not to listen to you and respond in an appropriate way. If you feel annoyed or angered by a student, it is better to let the anger pass or take it out in some other way than to take it out on the teen.
Teenagers can be rude and disrespectful in the classroom, especially to teachers. It is important that you never return a teenager's rudeness or abrasiveness. This only provides students with more reason to do so. Stay polite and respectful and with time your attitude will be deflected. If a teen student feels like he is respected, he will feel encouraged to keep it that way.
Students in their teen years are too old to be controlled and advised at all times. Give a teenager his space. When teenagers are left with some independence and a few responsibilities in the classroom, they feel more grown-up and more in control. Don't apply pressure and don't overcrowd. Don't snoop and try to keep a bit of a distance.
Teenagers will avoid communication and refrain from opening up to their problems if they are afraid they might be judged. Listen to your students, hear them out and try to understand the issue from their side. Teenagers often need an outlet and teachers can be an effective one, if only you take the time to pay attention. Offer comfort or advice after you have listened to your student's problem.