What is the function of the rounded and polished ends of nylon bristles in toothbrushes?

The rounded and polished ends of nylon bristles in toothbrushes are designed primarily to ensure safety while brushing. This specific design helps to minimize the risk of damaging the gums or causing irritation during the brushing process. When bristles have rounded tips, they are gentle against the soft tissues in the mouth, reducing the likelihood of causing micro-tears or abrasions that could lead to discomfort or even gum disease. Thus, the emphasis on safety is crucial for promoting oral health and encouraging effective brushing techniques.

The other options do not capture the primary purpose of the bristles' design. For instance, while aesthetics may play a role in toothbrush design, the rounded ends serve a functional purpose rather than simply enhancing appearance. Also, increasing the price of the toothbrush is not linked to the safety or health benefits provided by the bristles. Lastly, the flavor of toothpaste is unrelated to the structure or design of the toothbrush bristles.