Introduction: Papillon-Lefèvre syndrome(PLS) characterized by palmoplantar hyperkeratosis is a rare autosomal recessive genetic disorder with rapidly progressive periodontitis and premature loss of both deciduous and permanent teeth. In this study, we report the clinical and radiographic features of Papillon-Lefèvre syndrome in an 11- year-old girl and we also discuss the history and various theories about the etiology and treat‌ment planning for this syndrome.