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Caroid tooth powder was made by Breon Labs, a division of Sterling Drug. When I worked with them in the 1960's, we had a line of Caroid products which all contained a proteolytic enzyme called papain for breaking down protein. We would place a raw egg in a cup and sprinkle Caroid powder on it; quickly the protein in the egg would break down in the cup. The products ,except for Caroid and Bile, were very low sales volume and not marketed. When Sterling was dissolved, I do not know were the Caroid line was sold.