Rare syndrome known as hallerman streiff syndrome is a congenital disorderthat effects growth ,cranial development,hair growth &dental development less than 200 peoples in the world. Have this syndrome the cause of this disease is unknown Treatment. Treatment of Hallermann-Streiff syndrome (HSS) is based on the symptoms. Surgery is often necessary for the eye, head and facial features. Children with HSS also often need regular dental and orthodontic care