I received a free sample of this product to test. To begin with, the star shape does allow for the dog to clean its teeth, but that's about the only thing I found to be positive about this product. Compared to other dental chews, I noticed my dog had a harder time breaking this one down. He also kept sniffing it and was reluctant to eat it at times, which is really rare when it comes to the treats we give him. Not happy about the added preservatives, some of which are thought to be carcinogenic. I'll pass on buying these in the future.