Enamel

Enamel is a smooth hard covering substance. It may refer to:
 Tooth enamel, the hard mineralized surface of teeth
 Enamel (glass), a smooth, durable coating made of melted and fused glass powder

Related pages
 Enamel paint, a commercial paint that dries to an especially hard glossy finish
 Enameled wire, wire insulated with enamel-like coating