Only brush the teeth that you want your K-9 to keep!! Fantastic product to keep your pets teeth their pearly whites. Easy to use hand and finger brushes, and toothpaste that’s not bad tasting (yes we tried it). Start brushing in their puppy stages to have strong teeth through adulthood. Practice makes perfect, the first time we tried it on our 8 year old St. Bernard she was not to thrilled with putting an object other than a toy in her mouth, but after we started using it on our 3 month old puppy St. Bernard, in which she was just loving it, our oldest decided to let us try again, still wasn’t crazy about it, but humored us. Moral of the story, is to start them off young. The only drawback that we had was the finger brush was too small for a big handed person, but the brush works great. Great product, fantastic price!