Q.Give the dental formula of human beings.

Humans are heterodont (having different kinds of teeth for different functions) and diphyodont (having two successive sets of teeth in a lifetime — deciduous/milk teeth followed by permanent teeth). The dental formula expresses the number of each tooth type present in one half of the upper jaw and one half of the lower jaw; because the arrangement is symmetrical, the total count is obtained by multiplying by 2 (left/right) and again by 2 (upper/lower).

For the permanent (adult) dentition, the formula (Incisors / Canine / Premolars / Molars, per half-jaw, upper over lower) is:

I 2/2 — C 1/1 — PM 2/2 — M 3/3

written compactly as 2123/2123, meaning per half-jaw: 2 Incisors, 1 Canine, 2 Premolars, 3 Molars. …

Recall the standard I/C/PM/M notation for one half-jaw (upper over lower), fill in the number of each permanent tooth type, and multiply the …

• Confusing the permanent dental formula (2123/2123, 32 teeth) with the deciduous/milk formula (2102/2102, 20 teeth, no premolars). …