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Supernumerary teeth (or hyperdontia) are characterized by the presence of teeth in addition to the regular number of teeth. It is assumed that this is caused by disorders which occur during the period of tooth bud proliferation. There are several theories on this phenomenon: an atavitistic feature, additional teeth, the forming of an accessory bud of dental lamina. Hyperdontia appears more frequently in permanent dentition, in the frontal area of the dental arch and with a higher frequency in boys. Supernumerary teeth are classified by form, location, morphology and number. The occurrence of this anomaly is easily diagnosed, namely by some delay which occurs in the eruption times of permanent teeth, diastema, persistence of temporary teeth. Early diagnosis of supernumerary teeth is important, because by applying simple therapy measures the late consequences can be prevented. Among the mechanical complications this phenomenon can generate we recall: pathological radicular resorption, necrosis, neuralgia, etc. In most cases, erupted supernumerary teeth have to be extracted and the anomalies generated by their occurence are solved by orthodontic treatment. [ABSTRACT FROM AUTHOR]