Dr. Pierson (www.catinfo.org) states that even the cheapest generic canned food is healthier than the most expensive, high end dry food. As for dry food cleaning teeth this seems to be a falacy. Cats usually just swallow the kibble whole anyway without much crunching. Ideally we should be brushing our cats' teeth to prevent decay. I haven't tackled that yet, but have thought about needing to try it.