
Mine have all had lovely teeth until their deaths. Our Elka's always drew comment from the Vet as to how white and nice they were, and her granddaughter now 12 is just the same.
Only in the last couple of years one lost a front tooth due to an epulis (gum boil), as when the growth was removed it was found to have split the tooth.
Her daughter had a tooth abscess, and had to have one of the large upper teeth out. Mine all get raw recreational marrow bones and hooves to chew, and some teeth are a bit worn by late old age, but not to any great extent.
I do think tooth quality is inherited, diet in rearing and development, and though out life surely must play a part.
Maybe I have found the advantage of owning a breed that generally doesn't do retrieving (unless it's for themselves and edible), and certainly will not fetch a ball ;) .