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Why is nylon (nylon 6) and polypropylene chosen together to make a toothbrush? Specifically, how are they blended together during the production process, and what determines their price?

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A toothbrush need not be made of the two materials you mention. The two materials are choosen because of their low price of production*), ease of manufacture of the intended tooth brush (heat molding of the frame), moderate / tuneable flexibility of the material for the bristles (nylon). In comparsion to bristles of natural origin, nylon equally is easier to cleanse by rinsing with water, and dries rapidly ‒ offering less ground for bacteria to grow on them.

*) Waste disposal is not accounted here. While the brush, consisting of polymers, may be incarcerated, why do we throw away the whole toothbrush away if apparently only the heads / bristles wear out?

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