Brushing teeth with a micro-dose of fluoride each day in combination with low carb, low “stick” snacking are the most effective ways to help your child stay cavity free! Our Ready. Set. Smyle. toothpaste provides the optimal amount of fluoride for baby teeth and developing permanent teeth, making it suitable for both kids who can spit and those who can’t. One pump delivers the perfect amount for kids who can spit while a rice-sized half pump is ideal for younger children and infants until they can spit, usually around age six.