Green pigmentation in teeth is an uncommon condition associated with bilirubin deposits in dental hard tissues. Its occurrence causes anxiety to both child and family. The purpose of this paper is to present a case involving an eleven-year-old girl with green pigmentation of permanent teeth who underwent a liver transplant due to biliary atresia when she was one year old. The reported case confirms the relevance of past medical history in establishing the diagnosis and treatment plan of green teeth.