According to Paragraph 4 and 5, which of the following statements is NOT TRUE?

参考解析：

推理判断题。根据第四段最后一句“This, in turn, leaves behind a cut that is jagged rather than smooth.”可知，纸的边缘实际上是锯齿状的，而不是光滑的，A项正确；根据第四段第三句“It cuts you pretty quickly before you have the chance to realize it.”可知，纸张滑得太快，在你意识到之间，它已经割破了你的皮肤，B项正确；C项中的The paper fibers left behind in the wound“伤口里留下的纸纤维”没有涉及，C项错误；根据第五段最后一句“But paper creates cuts deep enough to reach the nociceptors but not deep enough to trigger the clotting mechanism, meaning it takes longer for new skin to replace the dead cells.”可知，但是纸张造成的切口深度足以触及伤害感受器，但深度不足以触发凝血机制，这意味着新皮肤需要更长的时间来替代死亡细胞。根据“not deep enough to trigger the clotting mechanism”可知凝血机制还未触发，所以会流血，这样需要更长的时间来长出新的皮肤，所以疼痛时间会延长，D项正确。故选C。