Have you been experiencing extreme tooth sensitivity recently and aren’t quite sure of the cause? It is very possible you might be experiencing the result of enamel erosion. Enamel is the outer layer of the tooth. Even though it is quite thin, it is the strongest substance in your body. Although strong, the enamel is not indestructible. Enamel can begin to wear away over time from normal wear and tear. However, there are many outside influences that can also cause enamel to show signs of wear.