lai when I put for the first time I thought yeah blah but actually reapplying the product a second time i start to see the difference compared to the current dentretien plastic product and what surprised me the time that the product remain bright (moin to 3 weeks) and fat being I'm super satisfied. c you have to put the price but when I saw the result and the number of months that keeps me the bottle c'st very profitable in the end.