I think the jury is still out. I've been using this product for 4 months and I don't notice any lightening. I don't notice my teeth discolouring. Maybe it's maintaining the status quo? My teeth are already relatively white (especially compared to most people I meet) and I don't drink coffee or beverages that stain my teeth, but I was hoping to make them whiter. However, I will continue to use it. I like the black stubble.
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