"What are the signs my cat has dental disease?"

Dental disease in cats is a slow, largely silent process — until it isn't

Feline dental disease is an umbrella term that covers several related conditions: periodontal disease (infection and inflammation of the structures supporting the teeth), tooth resorption (where the tooth structure breaks down from the inside out), stomatitis (severe, widespread inflammation of the mouth), and simple tartar buildup that hasn't yet become something worse. What they share is a common progression: bacteria accumulate along the gumline, form plaque, harden into tartar, and gradually begin destroying the gum tissue and bone anchoring the teeth. The catch is that cats are wired to hide discomfort, so the disease often advances quietly for months or years before an owner notices anything is wrong.

Several factors speed things up. Cats who eat exclusively soft or wet food get less mechanical abrasion on tooth surfaces, which can allow plaque to build faster. Breed plays a role too — flat-faced cats like Persians and Exotic Shorthairs are more prone to crowding and misalignment that traps debris. Genetics influence how aggressively some cats' immune systems respond to bacterial presence in the mouth, which partly explains why some cats develop severe stomatitis even with attentive care. Age is the biggest factor: the majority of cats over three have some measurable degree of periodontal disease, and it only becomes more prevalent with time.

Tooth resorption deserves special mention because it's both extremely common and frequently misunderstood. Unlike standard periodontal disease, it's not primarily driven by bacteria — the cat's own cells begin breaking down the tooth structure, often starting below the gumline where you can't see it. A cat with advanced tooth resorption may have a tooth that looks intact from the outside but is essentially hollow and excruciatingly painful. This is one reason dental X-rays matter so much — visual inspection alone misses a significant portion of what's actually happening in a cat's mouth.

Dental disease doesn't always announce itself the same way

Cats express oral discomfort in surprisingly varied ways — some obvious, some easy to chalk up to aging or personality. Here are the most common patterns owners describe.

Untreated dental disease doesn't stay in the mouth

It's tempting to put off dental concerns in cats — the appointments feel expensive, anesthesia feels scary, and a cat that's still eating seems like a cat that's probably okay. But the evidence on where untreated dental disease leads is sobering. Chronic oral infection creates a persistent source of bacteria that can enter the bloodstream, and studies have linked severe periodontal disease in cats to changes in kidney, liver, and heart function over time. More immediately, a cat living with dental pain is a cat in a diminished state: less playful, less social, eating less effectively, and potentially losing weight without an obvious explanation. The fact that they're not crying or hiding doesn't mean they're not hurting — it means they're a cat.

Tooth resorption is worth flagging separately because it's genuinely one of the more painful conditions a cat can experience, and it's both common and frequently undetected at home. Veterinary dental specialists estimate that tooth resorption affects somewhere between 20% and 60% of adult cats, depending on the study. The only reliable way to identify it is dental radiography under anesthesia — the same procedure many owners are nervous about. That's the reason the conversation about signs of dental disease almost always leads to a conversation about professional dental assessment.