Don't panic if permanent teeth are coming in behind baby teeth. Let Children's Dentistry give you the answers for when permanent teeth grow.
I see this every day. A child comes in with his permanent lower incisors coming in behind the baby teeth. We sometimes call it "Shark" teeth.
Baby teeth usually start to fall out around age 6, but sometimes permanent teeth can grow in behind baby teeth—often referred to as “shark teeth.” This condition.