Hi FrankiesDoggie,
My advice is if you want to maintain a healthy mouth get out the brush. A brush is necessary to sweep away the plaque that collects in the space between the gum and the tooth, Bone chewing cleans the crown of the tooth,,, but that is really more of a cosmetic problem than a health concern.
When the mouths of African Wild dogs and feral cats that ate a natural diet were examined it was found that they had clean teeth but the incidence of periodontal disease was quite high not to mention the fractured teeth that comes from bone chewing.
