Plaque Off didn't work with Missy. I used it for years and saw no difference. Missy has problem teeth since she has an overbite and doesn't like to chew on toys, etc. I think different products have different outcomes depending upon the fluff.
I brush her teeth every day with tartar control toothpaste and I decided to try PetzLife gel as an additional option. It does make a difference.

You use it like toothpaste but it has to be applied when there is no food or water for at least 30 minutes prior and 30 minutes after the application. They have different flavors. It is for cats too.
I would recommend it based upon my experience with Missy.