Children generally begin to replace their teeth around the age of 6 and continue to replace all of their baby teeth with permanent teeth until they are about 12 years old. Some children may start to replace their first permanent teeth around the age of 4, while others may not start to replace their teeth until they are 7 or 8. Parents need not worry too much when they see this situation, but they should focus on the following two points: 1. the order of eruption, if the child’s upper front teeth have not yet erupted, and the back teeth begin to replace, pay attention to the hospital in time to check, when there is often a dental disease; 2. the eruption is generally symmetrical, symmetrical teeth generally eruption time will not differ by more than six months. If the teeth on one side erupt and the teeth on the opposite side do not erupt within six months, take your child to the hospital for an examination as soon as possible to exclude some pathological conditions. In addition, in some cases, new teeth erupt but the old teeth have not yet fallen out, so it is important to take your child to the hospital as soon as possible to have the baby teeth extracted to help the permanent teeth erupt.