He has plaque build up round his teeth and a few month back the vet gave us some seaweed stuff called Plaque Off that we sprinkle on his food daily. He's been back today for something else but she looked in his mouth while he was there and said there's still some plaque there and it's looking like they're gonna need cleaning after christmas. Has anyone had this and how much does it cost? He's a Lhasa Apso.