The number and classes of teeth vary among mammals and the dental formula is used to differentiate humans from other mammalian species. Each of the two sets of teeth in the human (primary and secondary) can be expressed by their own dental formula. The formula expresses one half of the dentition and identifies class and the number of those teeth in each class. The total number of teeth in the formula is doubled to express the total number of teeth in the dentition.
The secondary (permanent) human dental formula is
The primary (deciduous) human dental formula is
Click on the movie icon above to view the human dental formulae.