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smooth; protective outer structure
The enamel trays are used for heat-based cooking (convection, oven, broil) in the Advantium. You can either place food right on it to cook and brown, or place a glass baking dish on it. You can not use the enamel tray for microwaving.
The hardest substance in our body is enamel which is the outer most covering of the teeth
fluoride toxicity, enamel hypoplasia, fluorosis, and mottled enamel
It is called the enamel. It's the most external layer of a tooth and the hardest substance in the body.