Flossing Child's Teeth Most parents think flossing is something kids start when they are older. But the moment a child’s teeth begin touching each other, brushing alone can’t clean between them anymore. That tiny contact area is where many childhood cavities begin. Once teeth touch, parents should help floss their child’s teeth at least once a day — especially before bedtime. It’s a simple habit that can prevent many cavities and help children keep their teeth healthy for life. Learn more about