I've been a big fan of the dental chews made by C.E.T. They get my dogs' teeth extremely clean and my dogs really enjoy them. When I was still in a search to look for the best dental chew on the market, I picked these up after seeing excellent views on Amazon. When I recieved them, I read the ingredients and saw beef hide listed as the first ingredient. I was pretty confused because I knew that raw hides are not digestible and that these treats are meant to be ingested. I did a bit of research and found that these treats are indeed digestible due to a special enzyme that is on the treat. Part of the reason why the treat cleans teeth so well is because they contain a special enzyme that does a great job fighting tar tar and plaque. My dog's teeth had some buildup on them, but after a week of having one treat a day I saw that there was great improvement. I've been switching back and forth between the different types of C.E.T. treats and so far I haven't found any that didn't work well. This treat is also highly recommended by my vet!