According to the New International Standard Medical & Health Encyclopedia, the hardest spot on the human body is the enamel covering the teeth. The next hardest spots are the bones that make up the human skeleton. Specifically, the jaw bone is the hardest bone in the human body, making it the next hardest spot on the body, according to the Chicago Museum of Science and Industry.
The New International Standard Medical & Health Encyclopedia reports that tooth enamel covers the exposed parts of your teeth, protecting the softer internal tooth structures. Tooth enamel is made up mainly from minerals and can be as strong as gemstones. Enamel needs to be strong so you can chew and eat food.
According to the New International Standard Medical & Health Encyclopedia, the bones of the skeleton are important because they support and shield critical internal organs. The skull houses and protects the brain, the organ that regulates all aspects of human survival such as breathing and circulation. The spine supports the rib cage which protects many important internal organs, such as the lungs, heart and liver. The pelvic girdle is made up of many bones that are connected to the spine by the sacrum, an important element for human mobility. The jaw bone supports the teeth and gums.