He says the most common type of permanent brain injuries are results of concussions. Dr. Gordon says helmet safety has improved over the years and coaches are stricter about handling injuries on the field. "For instance, if a kid has a mild concussion, some coaches call it 'gets his bell rung,' that kid needs to sit out the rest of the game." Grace football parent Rowdy Nutt says that's what coaches do on his son's team. "They're very cautious about injuries that occur." he says. "And so, yeah they're going to pay attention and pull kids off."