Treatment of permanent teeth in children - a very important task for Endodontists in Kansas permanent treated tooth should serve child all his or her life. Root formation and closing of the apex of the roots occurs during three years after its eruption. If during this period there was injury or infection of the tooth pulp this process can stop. Tooth turns to be very delicate and can easily break. Treatment of teeth with unformed roots is aimed to complete the process of their formation. Therefore endodontist clean and treat tooth roots and sealed with calcium-containing fillings by which the formation of the tooth roots end. After that, the tooth can be restored by permanent filling, inlay or crown.