Shark Teeth in Children—Should You Worry? If you notice a second row of teeth growing behind your child’s baby teeth, don’t panic—it’s a common condition, parents often refer to it as “shark teeth.” This usually happens when permanent teeth begin to come in before the baby teeth have fallen out. It's often due to crowding — when there's not enough space in the jaw for all the teeth to come in properly. As a result, the new teeth may grow in behind or in front of the baby teeth instead of pushing