I had bought an Eight in One dental kits for brushing my dog's teeth. In it, there were about five breath mints. My dog, Duke, loved these mints and thought it was a treat. Thy did a good job making his breath fresher and were big enough for them to be effective on his sized mouth.
After I ran out of these mints in the kit I bought a container of them for Duke. He ate them when I first bought them just as he did when they came from the dental kit. Over time, he would be less excited about the mints. He would take it from me, but then leave it on the floor. After about 3 months he didn't even take them from my anymore. He would sniff it, but not want it. I'm not sure if he just got used to the taste and did not want them anymore, or if the mints got stale. Either way, I tried to give one to my brother's dog and she did not want it either.
These mints work great and I would suggest trying them with your dog, but be ready for it when they get used to them and no longer want any.