Hi, I've been feeding this food to my cat, too but I haven't noticed any build up on his teeth. When the kibble size is small like it is with the TOTW, sometimes they don't chew it very well. My cat swallows it almost whole! He take a kibble and gives it maybe one crunch before he swallows it. By contrast, this same kitty will steal giant German Shepherd sized kibble from the dog dish and cruch, crunch, crunch happily away! maybe that's why his teeth are so clean? lol