Dentomaxillary anomalies are alterations in the spatial relationships between teeth teeth and their maxillary bone bases that in most cases “result from a relative discrepancy between the size of the teeth and the bones, regarding the analysis of the discrepancies, we can find that the teeth could be associated with the appearance of diastemas (in case the discrepancy is positive), crowding (when the discrepancy has a negative value) or a discrepancy in tooth size, called a discrepancy of Bolton. This review emphasizes the importance of including these measurements in the diagnosis in order to avoid a result with a poor predictable future.