Dental anatomy is the study of human tooth structures. The development, appearance, and classification of teeth fall within its purview. The function of teeth as they contact one another falls elsewhere, under dental occlusion. Tooth formation begins before birth, and teeth's eventual morphology is dictated during this time. Dental anatomy is also a taxonomical science: it is concerned with the naming of teeth and the structures of which they are made, this information serving a practical purpose in dental treatment.