Detailed studies on the relationship of wear facets, diet and functional morphology were pursued for early ancestors of cetaceans,22 but there are few investigations focused in understanding trends and implications of tooth wear in modern dolphins. Caldwell and Brown23 described patterns of dental wear in the killer whale (Orcinus orca) and related its occurrence with masticatory movements and feeding behaviour. On the other hand, Ramos et al. 24 related dental morphology and tooth wear to parameters such as sex, age and body length in the Franciscana (Pontoporia blainvillei) and Guiana dolphin (Sotalia guianensis). More recently, Foote et al. 25 observed distinct dental wear rates in different haplotypes of killer whales from the North Atlantic, suggesting that genetic and ecological divergence of populations may be reflected in dietary specializations and dental wear. The same idea was corroborated by Ford et al., 26 relating the extreme wear of offshore killer whales with a diet based on sharks, prey that can be extremely abrasive on teeth.