Question

What is the dental formula of three years child

Answer 1

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Realising that the child will not have molars, which are 6 in number on each jaw, and 3 on one side of each jaw. That reduces the total number of teeth in the child from 32(which would be the number when he grows up to become an adult), to 20. The 5-yr-old would have 2 incisors, 1 canine, and 2 premolars and 0 molars on each side of each jaw.

Dental formula is based on the count of teeth on one side of the jaw to the same, for the other side of the jaw. The numerator and denominator in this formula is multiplied by 2 and numerator is added to denominator to get the total number of teeth.

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Answer 2

Do you know? In mammals especially, the number of teeth in both the jaws varied with respect to their food habit. However, it is constant for a particular species.

When we represent the number of teeths according to their kind by any sort of equation, it is known as Dental Formula.

Now how to write the formula?

It is the formula showing the no. of teeths in one half of the upper/lower jaw.

It is separated (i.e. upper and lower jaw) by a horizontal line which is similar to that of a fraction in mathematics.

The no. of teeth shown in the formulae multiplied by 2, gives the total no. of teeth in a species.

Dental formula of Human.

CHILD (milk teeth) - 2 1 0 2 2 1 0 2

ADULTS - 2 1 2 3 2 1 2 3

Here:

Here you can see teeth in upper half jaw is 2 + 1 + 0 + 2 = 5. The total no. of teeth in upper jaw is 5 × 2 = 10. And similarly total no. of teeth in child = 10 × 2 ( both jaws) = 20.

In this way, we can find the total no. of teeth in all organisms by the help of given Dental Formula.

Dental formula for more animals:

Dog - 3 1 4 2 3 1 4 3

Cat - 3 1 3 1 ∣ 3 1 2 1

Cow - 0 0 3 3 ∣ 1 0 2 3

Elephant - 1 0 0 0 0 0 0 3

Note!!

The no. is arranged with correspondence with the kind of teeth in order of Incisors, Cannines, Pre molars, Molars in one half jaw in each row.