I just wanted to chime in, I have decided to move my cat from canned to dry food.
There are 2 reasons...
1)My cat had a problem that required having a tooth pulled. That was on canned food, I will explain this later.
2) It has improved her performance in the litterbox, I'll leave it at that but if anybody has a question just ask.
3) If you move to dry food you must make sure that the cat has water.
4) The reason I moved to dry food, (specifically royal canin) is for the larger kibbles...it sorta makes them chew them up more so it reduces vomiting but it also increases tooth cleaning.
Ok 4 reasons.
I dare you to brush your cats teeth.