Can you answer some questions about brain injuries and the NFL in the US?

I watched the film Concussion last week. I was well aware of the dangers of concussion for football players. However, in US football the head appears to be used as a battering ram and that makes the risk of brain injury much higher. The film left me with questions.

How has the NFL responded to public awareness of the dangers? Have they implemented better safety measures and what are those measures?

Is improved headwear available to help reduce risk? How effective (to your knowledge) is that headgear?

Parents, would you let your son play football? If you do, how do you reconcile the potential risks of brain injury to your child with their desire to play football?