CBSE Class 4 EVS Teeth Worksheet

A. Tick (✓) the correct options and fill in the blanks.

Question. The number of teeth in a permanent set are .............................. .
a. 25
b. 30
c. 32 
d. 35
Answer. C

Question. Teeth that help us bite food are .............................. .
a. incisors 
b. Premolars
c. canines
d. molars
Answer. A

Question. The part of the tooth that lies below the enamel and is not so hard is……………..
a. crown
b. Pulp
c. dentine 
d. root
Answer. C

Question. .............................. of teeth helps to remove bits of food stuck betwee teeth.
a.Toothbrush
b. Water
c. Brushing 
d. Nut cracker
Answer. C


B. Fill in the blanks.

1. The fungus that helps to make bread soft is .......yeast...... .
2. The microbe that converts milk to curd is .....bacteria......
3. ........Pulp...................... is the part of the tooth that has nerves and blood vessels.
4. Microbes that cause diseases are called ......germs...........
5. Malaria and dysentery are caused by ..........protozoa.........

C. Write T for true and F for false statements.

1. Eating fibrous food causes tooth decay. (F)
2. Typhoid and tuberculosis are caused by bacteria (T)
3. Crown is the part of the tooth that lies above the gum. (T)
4. Brushing once a day prevents teeth decay. (F)
5. Permanent teeth can be replaced. (F)
6. A new born baby has no teeth. (T)

Answer in one word.

1. the hardest part of the tooth ......enamel........................
2. the microorganisms that cannot be seen under a normal microscope .....microbes...............
3. a fungus that is eaten .....mushroom.........................
4. the sticky substance formed on teeth ......plaque...................
5. the crushing teeth .........premolars.....................

Short answer questions

Question. Why are teeth important?
Answer. Teeth give shape to the face, help us to speak and help us to chew the food well.

Question. What are milk teeth?
Answer. First set of teeth is called the milk teeth or temporary teeth.

Question. Mention the conditions that help microbes grow.
Answer. In the presence of moisture, food, air and warmth,
Microbes grow rapidly.

Question. Write any two uses of bacteria.
Answer.
• Some bacteria change milk to curd.
• Some bacteria help to decay dead plants and animals

Question. Name the diseases caused by fungi.
Answer.• Ringworm
Athletes’ foot

Long answer questions

Question. What are the different kinds of teeth? Explain with diagrams.
Answer. Incisors (biting teeth):-There are eight incisors in all.
Canines (tearing teeth):-. There are four canines.
Premolars (crushing teeth):- There are eight premolars in all.
Molars (grinding teeth):-There are twelve molars.

Question. What are microbes? Name the diseases caused by different kinds of microbes.
Answer. Microbes or microorganisms are very tiny living organisms.
Infectious disease         Type of microbe
Cold                                  Virus
Chickenpox                      Virus
German measles              Virus
Whooping cough              Bacterium
Bubonic plague                Bacterium
TB (Tuberculosis)             Bacterium
Malaria                             Protozoan
Ringworm                         Fungus
Athletes’ foot                    Fungus

Question. Mention any four tips to follow to prevent tooth decay.
Answer. 1. Brush your teeth twice a day
2.Rinse your mouth with water after every meal
3.Eat fibrous food.
4. Visit a dentist regularly for a dental check-up.

Question. What are the different parts of a tooth?
Answer. Teeth are made up of different layers — enamel, dentin, pulp. Enamel, which is the hardest substance in the body, is on the outside of the tooth. The second layer is dentin, which is softer than enamel, and the deepest layer inside the tooth is pulp, which consists of nerves and blood vessels.

Question. Explain the cause of a tooth cavity.
Answer. Tooth decay is the softening of your tooth enamel caused by acids. These acids are created when plaque bacteria break down sugar in your mouth

Higher Order Thinking 

Question. Why does a cavity cause pain only when it goes deep inside the tooth?
Answer.A cavity or crack can let bacteria into the inner layer pulp Which have nerves in it and we feel pain.

Question. As compared to a slice of bread kept outside a refrigerator, a slice of bread kept inside it, will last longer. Explain why?
Answer. Inside a refrigerator, because microbes cannot grow in very low temperature.

Q1. Fill in the blanks:

1._____________ help us to speak clearly.
2.______________ teeth grow when a child is about six months old.
3. ______________ helps us to taste food.
4. The hardest substance in the body is_____________________.
5. The inside of the tooth is filled with a soft substance called____________.
6. Incisors cut like_____________________.
7. Canines cut like an_____________________.
8. Molars crush like a ______________________.
9. _____________ and ______________ are good for the teeth.
10. A full set of adult teeth consists of ___________ teeth.

Q2. WRITE TRUE OR FALSE

1. Milk teeth are also called deciduous teeth. ( )
2. Toothache starts if the the hard enamel is broken down by caries. ( )
3. Canines are sharp, pointed teeth.( )
4. We should not see a dentist regularly. ( )
5. We should take good care of our teeth. ( )
6. There are 30 teeth in adult.( )