Question

NCERT VIII - Sciences

Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.

Answer 1

in toothbrush  not choose same type of plastics to make handle and bristles because bristles are used to clean our teeth and so it must be a type of smooth so not injured our gum but handles of toothbrush must be strong and tough so that it can give some grip and resist our efforts on it. 
for bristles thermoplastic type plastic are use 
and for handle thermosetting type plastic is use

Answer 2

Answer:

The handle and bristles of a tooth brush should be made of different materials. The material  which is used for making toothbrush handle should be hard and flexible; because the handle  has to withstand lot of stress and has to reach every corner of mouth. The material which is  used for making bristles should be soft, flexible yet durable; because the bristles should not  damage the tooth or gum but should last longer.

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