Replace a helmet that has become too small. Replace a helmet that has sustained damage. Don't store helmets in a hot car or trunk. There is no cure for brain injury. It is the Number 1 killer and disabler of children in America.
Helmets are eighty-five percent effective in protecting against brain injuries.
Wear your helmet no more than two fingers' width above the eyebrows. It should move only about one inch when pushed front to back and not move around when you shake your head. When buckled, you should be able to fit only one finger between the strap and your closed jaw. Use the strap and wear the helmet in the correct position. In Florida a bicycle must follow the same rules as cars.