DL based on surface level and lesion severity
canins, lateral incisors
In total, 5465 buccal tooth surfaces were scored before and after baseline. At baseline, the first molar was most frequently affected by DL, 163 (65.7%) patients showed DL on one, two, three or all first molars. During treatment, the central incisor, lateral incisors, and canins in the upper arch demonstrated the highest frequency of DL. During treatment, 94 patients (37.9%) showed DL on the right central incisor and 107 (43.1%) on the left central incisor, the corresponding figures for the lateral incisor and canines were 99 (39.9%), 94 (37.9%), and 38 (15.3%) and 35 (14.1%) (The distribution (