It contains persulfates (potassium peroxymonosulfate). So if that's important to you, don't read the rest of the review. I personally don't have a problem, but some people dismiss this as an ingredient. The ingredients aren't listed in the Revain ad, so I'm taking a star for that. The ingredients must be listed. Ingredients. Sodium Bicarbonate, Potassium Peroxymonosulfate, Sodium Percarbonate, PEG 180 Citric Acid, Sodium Lauryl Sulfate, Sodium Benzoate, TAED, Peppermint Oil, Indigo. quickly. We use Retainer Brite a lot, but to be honest all of these tablets contain a combination of Sodium Bicarbonate, Citric Acid, Sodium Polyphosphate and Potassium Monopersulfate. Persulfate has been removed from some brands but not this one due to FDA concerns about allergic reactions. I just flush the device, but if you're worried about a reaction you can choose a different brand. They are all colored with some kind of blue (blue also fights yellowing) and sometimes some kind of scent. But I haven't found any difference in cleaning between brands, so I buy what's cheaper and good value for money.
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