69.9% maxillary third molars had three roots. 89.76% mandibular third molars had two roots. 52.36% maxillary third molars had three canals. 55.71% mandibular third molars had three canals. 28.2% maxillary third molars had four canals. 29.42% mandibular third molars had two canals. Five-rooted maxillary third molars occurred in 0.34%, recorded first time. New canal configurations like 1-3-1, 3-4, 4-5 found in maxillary. New configurations like 3-1, 3-2, 3-4, 4-1 found in mandibular. Lateral canals in 11.77% maxillary, mostly apical third. Inter-canal communications in 12.48% maxillary. Root canal morphology varies by race and geographic area. Jordanian prevalences differ from American, Burmese, Thai, Polish due to ethnic backgrounds. No gender, age, or location effects on root/canal numbers.