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If you wish to know some slate pencil eating benefits, the following could be considered: Slate pencils contain calcium, which strengthens bones while also removing enamel from teeth. If an individual doesn't have enough calcium in their body, they may have the tendency to eat edible chalks. The slate pencil is made from a softer form of slate and was used just like a pencil to write on the slate board. Often one side of the board was used for writing and the other used for mathematics and drawing.