This study was aimed to compare the effectiveness of three techniques of caries removal in primary molars; Smart Burs, Carisolv gel and Conventional Rotary Drill. A total of 60 carious primary mandibular molars were selected. They were equally assigned into three groups; Group 1: Carisolv gel, Group 2: Conventional Rotary Drill, and Group 3: Smart Burs. The time needed to excavate all caries and the pain level caused by each technique were evaluated. Mann-Whitney U test showed that the conventional method needed the least time to excavate all caries, followed by Smart burs and CariSolv, respectively with a statistically significant difference (P<0.05). However, the Chi-Square test for pain values showed a significant difference between the groups in preference to Smart burs group (P<0.05). It was concluded that the conventional method in removing caries needs the least time to excavate all caries, followed by smart burs and CariSolv respectively. In addition, it was concluded that smart burs cause the least pain among the three methods.