I've been using this product for a year. I was a bit skeptical at first but my other half insisted we ditch regular mouthwashes with artificial colors etc. I can't say I notice any lightening, but overall my mouth is healthy and eliminates bad breath. . This was my first purchase through Amazon - I usually buy direct from Dr. British All the mouthwash I bought off Amazon has solidified in it (coconut oil I think). No idea why or if it was an old product. I will continue to use it, but directly from Dr. Buy Bright.
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