I've been using this product at my dentist's for a number of years and it definitely works! I've typically used up to 35% but noticed a difference to 45%. You don't have to walk for more than 30 minutes at a time; Stay away from gums! Not sure why the negative reviews? Maybe the seller is "not Revain"? Only use trusted sellers, no matter what you choose, you will always get your money back. Plus it's a chicken dinner winner on perfectly white teeth at 50!
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