What Are the Layers of the Tooth? Two main characters argue about the best metaphor for layers in a children's movie that was made many years ago. One is parfait, and the other is onions. One-character claims that everyone loves parfait so it's better to describe the item using layers of onions than using layers. Parfait layers are a good way to think about how your teeth are made. Each layer of teeth is layered. They make up a functional-or delicious-whole when they are all combined. Layers that aren't in balance won't work. What are the tooth layers ? The Enamel The outer crunchy topping of granola! The enamel is the outer, hard surface of the tooth. It protects the inner layers of the tooth against any outside threats. The hardest surface on the human body is enamel. It is made up of minerals, including a special calcium form called hydroxyapatite. To protect the soft layers within, the enamel cap layer extends to the gum line on both end