Oro-dental features encountered in patients presenting with Cockayne syndrome (see also Table 1). Anomalies of tooth number (a) - three congenitally missing second permanent molars (teeth 17, 37, 47) and the lower inferior left premolar (35) (arrow) in patient 10; tooth shape (b) - screwdriver shape incisors (teeth 11, 21 in patient 15); (c) hyper developed cingulum on the permanent upper lateral incisors (patient 12); tooth size (d) - permanent dentition with a microdont conical upper left lateral incisor (arrow) (tooth 22 in patient 8; the 12 is congenitally missing); (e) with microdontia in the primary dentition (patient 4, notice the diastemata separating the smaller primary teeth); (a) taurodontic upper permanent first molars in patient 10; radiculomegaly of canines, premolars and molars (f,g, patient 16) – (i) tooth structure with enamel hypoplasia (h in patient 2, i in patient 6) in the primary dentition. Dental plaque and biofilm subsequent to poor oral hygiene as well as gingivitis were seen in patient 11 (j). Dental crowding was visible in (k) for patient 17. ((a) patient 10; (b) patient 15; (c) patient 12; (d) patient 8; (e) patient 4; (f;g) patient 16; (h) patient 2; (i) patient 6; (j) patient 11; (k) patient 17).