Distribution and extent of carious lesions on the labial surface of affected teeth. When the distribution of lesions on incisors was examined in the test group, the most frequently affected tooth was the 51 (1.7%), while the other incisors (52, 61, 62) were affected by S-ECC equally, which represented 0.4% for each tooth. In the control group the most affected tooth was the 61, with lesions occurring in 7.6% of all 61 teeth present in the mouth, followed by teeth 51, 62 and 52, representing 5.3%, 5.3% and 3.9% each of these teeth present in the mouth. The most frequently affected teeth by carious lesions on labial surfaces in both groups were central incisors, with 71% of all lesions in the test groups and 58.7% of all lesions in the control group.