Whether your teen has substance abuse problems, behavioral issues, or mental health problems, intervention is necessary. There are several things you can do to help guide your teen onto the right path before she becomes an adult. 

Source: parentingteens.about.com

http://parentingteens.about.com/od/parentingtroubledteens/a/6-Tips-For-Parenting-Troubled-Teens.htm

Depression doesn't just go away on its own. In addition to getting help from a doctor or therapist, here are 5 things you can do to feel better.

Source: teenshealth.org

http://teenshealth.org/teen/your_mind/problems/depression_tips.html