The knowledge of the evolution of the dentition is of fundamental importance for those who work in dentistry. Teeth begin their formation inside the jaws in intrauterine life, to form the primary dentition and later the permanent dentition, which, under favorable conditions, can accompany us for the rest of our lives.Both dentitions, primary and permanent, are equally important and their harmonious development will be key in the maintenance of adequate dento-maxillofacial conditions, influencing in turn, the functional and social development of the individual.The knowledge of the characteristics of the development of the dentition in normal conditions, will allow the dentist the early detection of alterations in the dentition, in order to intervene when necessary and thus avoid the development of various dentomaxillary anomalies, which will be detrimental to the patient, as well as to understand the possible causes and make appropriate decisions when a dentomaxillary anomaly is already installed.