Oral anomalies in Nigerian children.

A total of 2203 Nigerian school-age children (10-19 yr) were examined clinically for the presence of oral anomalies. The following prevalence figures were found: commissural lip pits (2.9%), ankyloglossia (0.2%), geographic tongue (0.3%), fissured tongue (0.8%), torus palatinus (4.5%), torus mandibularis (1.9%), snowcap type amelogenesis imperfecta (0.2%), localized enamel hypomaturation (11.7%), missing lateral incisors (0.7%), and peg lateral incisors (1.5%). None of the following conditions was found: cleft chin, cleft lip, double lip, medium rhomboid glossitis, bifid tongue, macroglossia, cleft palate or cleft lip and palate.