What is Tooth Enamel Erosion and Can It Be Treated? Did you know that 250 tooth enamel is the strongest and most durable tissue within our body? It is stronger than our bones, and harder than steel! Tooth enamel is the substance on the outside layer of your teeth. Enamel is responsible for protecting your teeth from damage. However, don't let the strength of enamel fool you. Tooth enamel can be broken down and ...