So, you're chomping on a wonderful PB & J sandwich when that smooth, creamy mouthful attacks you. Well, what actually happens is that your unsuspecting tooth hits one of the little peanut nuggets that make chunky peanut butter so -- chunky. There are lots of foods that have hard parts, like seeds, inside something soft, like pulp. It's easy to forget that the hard chunks are there, which makes soft-hard foods tricky to eat and more likely to cause problems. Some common injuries are cracked teeth, jaw injuries and small bits of food wedged behind gums or between teeth.