Canal number in each root of First maxillary molars First maxillary molars Canal number n% Mesiobuccal root 1 canal 11 39, 3 2 canals 17 60, 7 Distobuccal root 1 canal 27 96, 4 2 canals 1 3, 6 Palatal root 1 canal 28 100 100% of the palatal root has 1 canal, 96.4% of the distobuccal root has 1 canal, there is 3.6% of the distobuccal root having 2 canals.