I've used this toothpaste for several months, so I can't give a long-term review, but it seems to be working relatively well. However, when I compared it to the other Crest toothpaste I had used (Crest Pro-Health, Extra Whitening Power), the other Crest was ADA accepted while this product (Crest Pro-Health, Sensitive & Enamel Shield) was not. I checked both the toothpaste tube and the box in which the tube was sold, and neither of them have the ADA accepted seal. So I have to ask: Why are some types of Crest toothpasted accepted by the American Dental Association while others are not? The active ingredient in this product, which is not ADA accepted, is stannous fluoride while the active ingredient in the other product mentioned above, which is ADA accepted, is sodium fluoride. Is sodium fluoride accepted by the ADA while stannous fluoride is not, or is there some other reason? In my opinion, any toothpaste I buy from Crest (Proctor & Gamble) should be ADA accepted.