After a recent wellness visit with the vet she discovered that my male Angus has some pretty big plaque/calcus build up on his backmost molar. I brush their teeth regularly -- much to their protest but they love the toothpaste taste- but must have missed the molar. Actuallly, both dogs have plaque build up on their back teeth. I told the vet I would try to get it off with a sonic tools and she recommended Healthy Mouth that you put in the water to try to soften it before I attempt it. I have read a lot of dogs won't drink the water after it is added and it is expensive. Anyone have any experience with it?? I dread the vet bill if I can't remove it..