Teeth anatomy

Teeth are calcified structures found in the oral cavity embedded to the upper jaw (maxilla) and lower jaw (mandible). Human teeth are heterodont and characterized by four tooth classes: incisors, canines, premolars, and molars. Human teeth are also diphyodont because there are two generations of teeth during a lifespan: 20 deciduous (primary) teeth and 32 permanent teeth. The primary dentition consists of the two types of incisors - central and lateral, canines, and two types of molars - first and second. The primary incisors, canines, and molars get replaced by the successional permanent incisors, canines, and premolars. Permanent dentition also consists of the additional teeth that are three types of molars - first, second, and third. The process fo identifying teeth uses the Universal National System. In the maxilla, permanent adult teeth are numbered 1 through 16 from right to left, and primary teeth are labeled with letters A through J from right to left. In the mandible, permanent adult teeth are numbered 17 through 32 from left to right, and primary teeth are labeled with letters K through T from left to right.