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Papain, the papaya enzyme was the effective ingredient in Caroid toothpowder. Very effective. Then the company took papain out of the mix for some reason. Not sure when or why that was. Maybe they wanted to save money with cheaper ingredients. Caroid then became just another useless toothpowder, lost customers, went out of business. So what you should do now is find a good source of papain powder and mix your own dentifrice. Duckduckgo is the best search engine, you will find many sources for papain there.