The cause of double rows of teeth in children is delayed shedding of milk teeth. If the milk teeth are loose, you can wait for them to fall out on their own; if they are not loose, you need to go to the hospital to have them extracted. 1. Under normal circumstances, most children change their teeth at the age of 5 to 7, when the milk teeth will gradually loosen and fall off and the permanent teeth will erupt. If the milk teeth are still loose when the permanent teeth erupt, a double row of teeth may occur. 2. If the milk teeth are loose, you can wait for the teeth to fall out; if the milk teeth are not loose, it can affect the eruption and normal growth of the permanent teeth, the bite of the teeth, and the appearance of the teeth for a long time, therefore, it is recommended to go to the hospital to extract the teeth. It is not recommended to pull out the tooth by yourself, which may cause bleeding, oral infection, and the tooth cannot be pulled out completely.