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Magic Erasers are actually made of melamine foam, which has been used for decades as an insulation and soundproofing material. About 10 years ago, some smarty-pants discovered that melamine foam was also an effective abrasive cleaner!
Looking for a better, more effective and more gentle way to clean my teeth I tried a piece of "magic eraser sponge". It's the perfect way to remove stains from teeth! ... Melamine foam is not toxic and not corrosive but it can easily damage the membranes of skin cells if the sponge rubs along your gums or any soft skin.