On the second day of the toothache.
Emily stood in front of the bathroom mirror, on tiptoes, looking to see if her right cheek was swollen. She touched it with her hand; it felt swollen, but her reflection showed no sign of redness or swelling. It must be all in my mind, she thought. After checking several times and confirming this, she looked at the toothpaste and toothbrush. I brush my teeth every day, yet I still have cavities! This toothpaste is completely useless, she complained internally. She gently squeezed out some toothpaste, silently lamenting, Humans really are fragile. Any abnormality in a single organ can trigger a whole series of chain reactions. A small cavity in one tooth is causing me unbearable pain.
