Experts consider periodontal disease in cats and dogs to be irreversible, so no, you can’t “fix” periodontal disease, but it can be stopped in its tracks, says Kan-Rohrer. “Periodontitis is considered irreversible because the bone loss that has occurred does not regenerate,” she explains. “It can only be stabilized but cannot return to a full healthy stage. Once diagnosed, treatment should aim to cease the progression.”