Human Teeth Class 4 - EVS kkgoenka

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Human Teeth 









By Aashish Gupta Sir 













             Class   4              

Human teeth

There are 2 kinds of teeth a human have in his lifetime

1. Milk Teeth - These teeth remains upto first 8 to 10 years of age. These are 20 in number.

2. Permanent Teeth - They remain for rest of human life.These are 32 in number.


Different kinds of permanent teeth in a Human











There are 4 kinds of teeth in human.

Incisors (8) - to cut the food - These are front teeth . They are 4 each in upper and lower jaw.

Canines (4)  - use to tear the food - They are near incisors.These are total 4 in number 2 each in Upper and lower jaw.

Pre Molars (8) -  to crush the food - They are 8 in total , 4 in each jaw.

Molars (12) -  to grind the food - They are 12 in total , 6 in each jaw.

Code to Learn -       
[ I C PM - (2123)×4 = 32 ]


Care of Teeth

1. We should regularly brush our teeth two times daily.

2.  If you do not brush your teeth regularly then bacteria can build up a clear sticky film on your teeth and it may cause teeth decay. 

3. Cavities can be formed.


Ques. A.  Fill in the blanks using words in the box -

bacteria viruses pulp canines permanent incisors 

1.      ............ are the smallest microbes.

2.   A person who is 32 years old should have 32 ................  teeth.

3.   In our mouth the eight ..............in the front are cutting teeth.

4.   ................ are the most abundant microbes on the earth.

5.   The sharp and pointed teeth in our mouth are called .............  .

6.   A tooth with a cavity will start paining if the cavity reaches the ............ .
Ques.B. Answer the following questions -

Q.1. How many sets of teeth do humans have during their lifetime ? Name them.

Q.2.  What will happen to our teeth if we do not brush them regularly ?

Q. 3.   Name different kinds of teeth human has and say what each is used for ?
 
Ques. C.  Write T for true and F for false statements -

 1.  Children  have 32 milk teeth.

2.  All our teeth have the same shape.

3.  Premolars and Molars are used to  crush and grind food.

4.  The surface of your teeth is harder than bone.

5.  A microbe is as small as a grain of sand.

6.   All microbes are useful to us.

Ques. D. Identify type of  teeth and write their name -










A .............              B .............

C .............              D .............
















Important Links











https://evskkgoenka.blogspot.com/2021/06/Plant-World-EVS-kkgoenka.html


https://evskkgoenka.blogspot.com/2021/06/Universe-EVS-kkgoenka.html

















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