Along with what others have said about dry dog food. Both of my puppies eat rawhide bones which are supposed to clean the teeth while they are eating them. I prefer american rawhide the brand because its made in the usa and the twists are much stronger than other brands I have tried.
Also, it seems like your 6 year old never had all of his baby teeth out! My one puppy had the rest of his baby teeth pulled (at my request) when he was 6 months old going to get neutered, he has all of his adult teeth now and his breath is a neutral smell. |