The dentition of humans is diphyodont type meaning there are two sets of teeth formed during their lifetime, one of which is the milk teeth. The dental formula 2.1.0.22.1.0.2 × 2 = 20 depicts that there are 2 incisors, 1 canine, 0 premolars and 2 molars in the upper and lower half of the jaw. To complete the set of teeth it is multiplied by 2 and thus there are 20 milk teeth.