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SAI INTERNATIONAL SCHOOL


               CLASS-IV


                                                                 SCIENCE


               CHAPTER-3- OUR TEETH AND MICROBES


               SUB TOPIC-TAKING CARE OF TEETH


               1. Bryce does not brush his teeth properly. Every time he eats, he
               does not wash his mouth also. One day, he felt lot of pain in his

               premolar tooth. He showed it to his mother. His mother was shocked
               to see such a huge cavity inside the tooth. Immediately he went to

               the dentist with his mother. What could be the reason of the cavity?

               Write five ways how can you take care of your own teeth.




               3. Observe the picture and answer following questions.























                   a.  Name the yellow coloured substance that is deposited on teeth.
                   b.  How is it formed?

                   c.  How is it harmful to us?
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