Thorough treatment and teaching your family not to share personal items will help prevent head lice infestation again.
Sources of possible infestation (bedding, furniture, hats, clothing, combs and brushes) must be disinfected by laundering/dry cleaning, or sometimes discarding entirely. Items that cannot be run through the dryer (i.e stuffed animals and toys) can be placed in a sealed plastic bag for 10-14 days, and hair care items should be soaked in hot water for 15 minutes. A thorough vacuuming will get rid of lice or egg shells that are left behind.
Teach your child to avoid sharing combs, hair accessories and hats. If your child has been infested with head lice, report it to their school immediately so other children attending will be less likely to have an infestation themselves.