Hi Olivia-
I too, agree with what anon101 wrote. Now that some of the teeth have begun to decay it’s past the point of no return. Those teeth will likely need to be extracted to prevent more damage and infection. Also, periodontal disease can also lead to disease in other organs especially as they get older.
Raw bones, like many other methods of oral care do not reach the gum line of the pet and therefore can not reverse or prevent periodontal disease. Regular brushing and dentals (when suggested by your vet) are the best way to provide a proper oral health regime for your dogs.
And yes, I would absolutely be concerned about any hard bone cracking their teeth with the state they are in as you describe it.
