The aim was to investigate the existence of Stomatology in Niš cusps of the lower M1 and M2. Investigation was done on the working models of 400 orthodontik patients (164 males and 236 females), of Clinik of Dentistry in Niš. Results show that the lower molars M1 at the molars group are least subject to reduction so, the largest number of patients in gender group (75,61% boys and 66,95% girls) has a presence in all five basic cusps type M1 5. Type M1 4, where there is complete absence of HLD-hipokonulids has 21,35% of boys and 32,63% of girls. The presence of six cusps was found at 3,05% of boys and 0,42% of girls. Type M2 4 dominates in both sexes (86,59 of boys and 91,1% of girls), while type M2 5 was found in a much smaller percentage (13,41% of boys and 8,9% of girls). It is found the complete absence of a distovestibular cusp-hipoconulids.
