I have 5 cats altogether. 2 are on raw only, and 2 are on canned only and 1 is on kibble cause she's an addict. Anyways, I am wanting to give my canned food kitties some RMB's a few times a week for dental health. Will that make much of a difference if it's just a few times a week? They are both starting to get some tartar, one is 4 almost 5 the other is 3 almost 4 years old.