Talk to your children about why you want them to protect their heads. There are many things you can tell your children to convince them of the importance of helmet use. Bikes are vehicles, not toys. You love and value them and their intelligence. They can hurt their brains permanently or even die of head injuries.
Most professional athletes use helmets when participating in sports.
Bicycle racers are now required to use them when racing in the United States and in the Olympics. Reward your kids for wearing helmets. Don't let children ride their bikes unless they wear their helmets. If you allow your children to ride occasionally without their helmets, they won't believe that helmet use really is important. Tell your children they have to find another way to get where they are going if they don't want to use their helmets.