The teeth are so fitted into the jaws that are crowns are above the gums and form the dental rows, the upper (maxillary) and the lower (mandibular) rows. Each row consists of 16 teeth arranged in the form of dental arch.

      Five surfaces are distinguished in each tooth (1) facies vestibularis, facing the vestibule of the mouth; in the anterior tooth it comes in contact with the lip mucosa and is called facies labialis, while in the posterior teeth it touches the mucosa of the checks and is called facies buccalis medical billing training india focueson these for proper coding.