Dental systems are of two types - homodont and heterodont, which in turn are classified into monophyodont and diphyodont. With homodont dental system all teeth have the same shape throughout the range, for example, like have fishes, while humans and other primates have a heterodont system with different shapes and functions of teeth. Diphyodont dental sustem implies teeth shift, and monophyodont system means a life with one set. In minority is polyphyodont whose teeth are able to regenerate.

Human's dental system according to this classification is heterodont diphyodont. Teeth are formed at the prenatal period when the pregnancy is about 7 weeks. Baby teeth begin to erupt at the age of 6-7 months, and sometimes even later.  The child has already 20 milk teeth at the age of two. There is a one-time changing of teeth when the system of attachment of baby teeth is gradually destroyed to make room for the permanent teeth. The process begins at age 6-7 years and completes in 12-14 years. It should be borne in mind that there is a question of incisors, canines, first and second premolars, and the second molars. The thirds molars (the wisdom teeth) can start to erupt in adolescence or not appear at all.

Dental system is recorded by using the notation. Adults have a dental notation that looks like this: 87654321 | 12345678. Primary dental notation is represented by Latin numerals, and the permanent - Arabic.

The full set of 32 permanent teeth in half on each jaw consists of eight incisors, four canines, eight premolars, twelve molars.

Root system includes (except wisdom teeth in which the root system has a varied structure):

- all permanent incisors, canines, the lower first and second premolars have one root;

- the lower first and second molars of the first upper premolar have two roots;

- the upper first and second molars have three roots.

The structure of tooth is a dentin with a cavity which covered with an enamel and a cement. Inside the pulp is a full of blood vessels and nerves of loose connective tissue. Each tooth has its own characteristic form, structure and location. In addition, each tooth has its own blood and lymph vessels, as well as your nervous apparatus. Anatomically tooth consists of enamel crown dentin neck cavity crowns, cement, tooth root canals and its apex, the apex of the tooth hole, and the bottom of the pulp, horns crown cavity.

Although common in the structure the each tooth is unique, important and has the characteristic features according to the functions that it performs. We hope that this article will not only bring you the new and useful information, but also allow you to understand what is meant experts "Doctor Zub" clinic when discussing the stages of your treatment.