Yorkies are known for the rapid tartar formation, and there are several things that you can do to cut down on this. While tooth brushing is important, it's really hard to do a through job on a dog, so this should be just part of the program. We have been using Petzlife gel that is said to soften tartar and make it easier to brush away. Hard kibble is another choice we have made, I also am a firm believer in Bully sticks, and think they help scrape the teeth of tartar, much like a tooth cleaning. So far so good, and the vet was very impressed with Joey's teeth, and said whatever we are doing to keep it up. Joey's breeder also had a visit with him recently, and thought I was doing a wonderful job brushing his teeth. I really think it's the Petzlife and bullysticks!