Four parents signed up for my teen suicide prevention talk. The school cancelled it, and I spent six months deciding the parents who stayed home were in denial. I was wrong. A sign-up sheet is a public act. You can be deeply worried about your teenager and still not want your name on a list in the school office. Here is what I learned running these sessions since, and what to do when you are quietly worried.

After my 14-year-old daughter Maddie died by suicide, I created a talk called "Wake Up: You Could Lose Your Teen to Suicide." Four parents signed up. The school cancelled. Most parents believe "that would never happen in our family." But 40% of teens experience significant mental health changes during adolescence—and many won't tell their parents. The warning signs were there. I just didn't know what I was looking at.