Classification of Teeth

Tooth bites are divided into three main classes, which are Class I, Class II, and Class III.

Class I: Class-I-image This is where the bite is balanced. There is a normal interaction between the jaws and the lower and upper teeth.   Class II: Class-II-image This class exhibits an abnormal interaction of the jaws, lower and upper teeth. Here, the top front teeth and jaw protrude forward more than the bottom front teeth and jaw. A feature of this abnormality manifests in a convex profile with a drawn back chin and bottom lip. This condition is caused by excess growth of the top jaw, scanty growth of the bottom jaw, or a combination of both. Generally, Class II conditions can be genetically acquired, and environmentally worsened by certain habits e.g. thumb sucking. The treatment of Class II bad bites revolves round the redirection of the top teeth, bottom teeth, and jaw growth in order to bring them into proper alignment.   Class III: Class-III-image Class III conditions are the opposite of Class II conditions. Here, there is also an abnormal interaction of the jaws, lower and upper teeth, but in this case, the bottom front teeth and jaw protrude forward more than the top front teeth and jaw. There is also a manifestation of a concave profile with a protruding chin. This condition is caused by excess growth of the bottom jaw, scanty growth of the top jaw, or a combination of both. This can also be genetically acquired.

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