Question

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

Answer 1

The handle and the bristles of a toothbrush cannot be made of the same plastic because the handle of a toothbrush has to be hard and rigid whereas the bristles of a toothbrush have to be soft and flexible. Therefore, the handle of the toothbrush should be made of thermosetting plastic whereas its bristles should be made of thermoplastic such as nylon.