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The dental formula expresses the arrangement of teeth in each half of the upper jaw and the lower jaw. The entire formula is multiplied by two to express the total number of teeth.

The dental formula for permanent teeth in humans is: 

Each half of the upper jaw and the lower jaw has 2 incisors, 1 canine, 2 premolars, and 3 molars. An adult human has 32 permanent teeth. Thus, the dental formula becomes 2123/2123 or it can also be represented as I 2/2, C 1/1, PM 2/2, M 3/3 where I = Incisors, C = Canine, PM = premolar, and M = molar.

In the case of 2133, there are 3 premolars and 3 molars in each half of the upper and lower jaw. It is found in ringed lemur, galago, loris and capuchin monkey.

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