i've tried quite a few whitening toothpastes...this one is the BEST!! after just a few days of use, i saw very noticable improvement. unlike when i used crest 3D white luxe...that stuff is crap and a waste of money, along with the other ones that i've tried. so i'll be sticking with my arm and hammer. it also has stain defense which is great because im a coffee drinker. i HIGHLY recommend!!!