Brain injury experts believe concussions that aren't given proper time to heal can cause long-term effects on mental health (“Farmer…”). Athletes who suffer concussions but don't report them are most at risk. Those who suffer 3 or more concussions without proper treatment have dramatically increased chances of having memory problems, such as Alzheimer's, along with potential neurological impairment. Concussions, though hard to detect, must be properly treated to be able to fully restore neurological activity (“Emmons…”). These injuries are so serious, that improper treatment can lead to irreversible brain damage, or even death. The negative effects of concussions are most dangerous to teen athletes. Concussions have a negative impact on the brain because teen athletes are most vulnerable to the effects of concussions. This is because maturing brains are especially susceptible to concussions, in that there are millions of teen athletes participating in high school athletics each year, and that age matters in recovering from a brain injury