No advice for you sorry, just commeserations. Five year old Missy the greyhound just had most of her remaining teeth out last week. Sh'e now just for the four canines left. We've had her three years and her teeth were just rancid when she moved in. We've spent years having them cleaned and pulled, giving her chicken frames and necks, other bones, Hills SD dental biscuits.... Her gingivitis just wouldn't go away and the teeth kept rotting, and no way was she going to tolerate tooth brushing....
So now she's pretty much toothless. Good news is though, without her sore gums, she's a much happier girl!