Questions & Answers

Human milk teeth set has the dental formula $\dfrac{{}}{{}} \times 2 = 20$. Explain.

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Hint: Dentition is mainly used to describe the arrangement of teeth, including their number and types. A baby is usually born with no visible teeth in their mouth, in a newborn baby, there are 20 fully formed milk teeth lying underneath the gums and these loosen and fall out between the ages of 6 to 10 years to give way to adult teeth.

Complete step by step answer:
The method of expressing or describing the total number of teeth in man and animals according to the arrangement is termed as the dental formula. The letters used in this formula are based on the 4 types of teeth like – Incisor, canine, premolar and molar.
\[Dental{\text{ }}formula{\text{ }} = \;\dfrac{{the{\text{ }}number{\text{ }}of{\text{ }}each{\text{ }}type{\text{ }}of{\text{ }}teeth{\text{ }}in{\text{ }}upper{\text{ }}row}}{{the{\text{ }}number{\text{ }}of{\text{ }}each{\text{ }}type{\text{ }}of{\text{ }}teeth{\text{ }}in{\text{ }}lower{\text{ }}row}}\]

Humans have the diphyodont dentition. These are the milk teeth and permanent teeth. Milk teeth are deciduous and replaced by the permanent teeth.
Milk teeth are 20 numbers. Premolar and molars teeth (3rd) not present in milk teeth set.
Milk Teeth $ = \dfrac{{}}{{}} \times 2 = 20$

There are 2 incisors, 1 canine, 0 premolars and 2 molars in the upper and lower half.

Note: Milk teeth are very important for the normal growth and development of the child. They allow the proper development of speech.
They ensure proper tooth alignment when the permanent teeth begin to erupt.
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