we've been an arm & hammer household for some time, but the baking soda formula seemed to be giving one of my adult cats a weird combination of stale pretzel and dog breath. it turns out greenies aren't all they're cracked up to be, and enzymatic products only kept the problem from getting worse... but this is it, the last pet dental product I'll ever use. the brush bristles are much softer than than others I've used, and the tapered shape lets you get in the sides. I was expecting something a little smaller, but the "dog side" ended up being a handy tongue brush. after a single use, my pretzel breath boy smells like... nothing! wow wow WOW.