I am interested in the Diana Stalder skin whitening products. Can you please tell me if the whitening effect is permanent?
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With any topical skin whitening/lightening product, once you stop using it, your skin will eventually return to normal melanin production levels, so it will tend to revert to its natural color over time, depending largely on sun exposure. Of course, one important element is to minimize sun exposure and use a good sun block. Depending on the nature of any scars or other skin pigmentations, they might not return as dark as they once were—in other words, your skin tone might continue to be more even. But the only way to really ensure that you maintain your results is to continue with a "maintenance" regimen, either using a milder product (like switching from the Papaya Kojic Soap or Glutathione Soap to the Licorice Beauty Bar) or use the same products less often (maybe 2-3 times a week instead of once or twice daily).
Remember, no topical skin whitening product produces permanent results. Other than surgical approaches, there is no one that can claim permanent results without some kind of maintenance.