I use PlaqueOff for my old Border Collie. He cant have anything rawhide to chew on or Dentastix etc because of a sensitive digestive system and the vet suggested this. Its a powder made from seaweed for bad breath, tartar and plaque and I find it works very well. I sprinkle two tiny scoops on his food daily. It comes in a little tub and is easily available. I buy mine from my local RSPCA animal home shop but large pet shops sell it.