Dental disease is the most common disease we see in cats and dogs. Both cats and dogs can develop diseases of the teeth and gums including gingivitis and periodontal disease, which are caused by food and bacteria building up and hardening on the teeth. It can lead to gum irritation, gingival recession and bone loss to the point that teeth may need to be extracted. Gingivitis is also known as early stage gum disease, which progresses to periodontitis if not treated.  Tooth resorption, where tooth structure breaks down and can lead to pain and refusal to eat, is common in cats. It is serious and requires diligent care by a veterinarian.