Crest is usually known for their quality products, and this is no exception. I can't say it will be the same for everyone, but the effects it has had on my teeth are noticeably positive. I drink a cup of tea every morning and this has led to some yellowing. I also brush my teeth at least twice a day, but with regular toothpastes, it doesn't do squat with the stains that I have accumulated over the years. I switched to this brand of toothpaste recently, say about several months ago, and my teeth are 2 shades whiter than they use to be and I haven't stopped drinking tea yet.
I don't know what to show or tell you that will prove their anti cavity fighting effectiveness, but I haven't had one so far, so it seems to be working.
The only problem I really have with this toothpaste is the dispenser. It doesn't seem practical to me for effective squeezing. The base is too wide and hard, which is asking for leftover toothpaste that can't be pushed out without a lot of force, or cutting open the thing. Other than that though, it doesn't take up much room, it stands just fine, and it doesn't create a mess.
I like it, but I think I'm going to stick with the flexible tubes of paste instead.