Dental Disease and Resorptive Lesions in Cats

Dental disease is one of the most common health problems in cats, and by middle age most cats have some degree of it — including a specific, painful condition called tooth resorption that a home exam usually can't catch. Left unmanaged, it causes chronic pain and can affect a cat's eating and general health well beyond the mouth.

This article does not replace a veterinarian. Diagnosing and treating dental disease, including resorptive lesions, requires a hands-on oral exam and usually dental X-rays under anesthesia.

What owners can actually see at home

A lot of feline dental disease hides well, but some signs are visible if you know to look:

• Bad breath that's more than "cat breath"
• Red, swollen, or bleeding gums
• Brown or yellow tartar buildup, especially near the gumline
• Drooling, or pawing at the mouth
• Dropping food, chewing carefully on one side, or favoring soft food
• Reduced interest in eating, or slower eating than usual

Cats are also good at masking mouth pain and will often keep eating even when a tooth is clearly diseased, so the absence of obvious symptoms doesn't mean the mouth is healthy. This is part of the same pattern covered in how cats hide illness and pain.

What resorptive lesions actually are

Tooth resorption (sometimes called FORL, feline odontoclastic resorptive lesion) is a process where the cat's own body starts breaking down the structure of a tooth, often beginning below the gumline where it can't be seen. It's extremely common in cats and is different from ordinary cavities or plaque-driven periodontal disease — it isn't primarily a hygiene problem, and its exact cause isn't fully settled.

The defining feature is pain: a tooth affected by resorption is often sensitive or painful even before it looks obviously abnormal, which is why vets probe each tooth individually during a dental exam and rely on dental X-rays to find lesions that are still under the gumline.

Stages and what they typically mean

Only a vet can stage a lesion accurately, and the right course of action is decided case by case — this table is a general pattern, not a way to self-diagnose from symptoms.

Why a professional cleaning is different from brushing at home

Home brushing helps manage plaque above the gumline and is genuinely worth doing consistently. It cannot reach disease under the gumline, cannot find a resorptive lesion, and cannot treat one once it exists. A veterinary dental procedure typically includes:

• Full mouth X-rays, since a large share of dental disease in cats is invisible without them
• Scaling above and below the gumline
• Probing each tooth for pockets, mobility, and pain response
• Extraction of any tooth that's too damaged to save

This is done under general anesthesia because a cat will not tolerate X-rays or subgingival scaling while awake, and because a still patient is safer for a thorough exam.

Everyday prevention that actually helps

• Daily brushing with a cat-safe enzymatic toothpaste is the single most effective home habit, even if it only happens a few times a week realistically.
• Dental-specific diets or treats with the Veterinary Oral Health Council (VOHC) seal have supporting evidence — ask your vet whether one fits your cat.
• Routine vet checks catch problems while they're still manageable; see how often a cat needs a vet checkup for a general schedule.
• Watching for the early signs listed above, rather than waiting for a cat to stop eating.

None of these prevent resorptive lesions specifically, but they do reduce overall plaque-driven disease and make it more likely problems are caught on a routine exam rather than once a cat is in pain.

When to act now vs. this week vs. the next checkup

A cat that's still eating but showing any of the mouth-pain behaviors above doesn't need an emergency visit, but doesn't need to wait for the annual exam either — a dedicated dental appointment is the right middle step.

How this looks different by age and health status

• Kittens have their own dental issue to watch for — retained deciduous (baby) teeth that don't fall out on schedule and can crowd the adult teeth coming in. Different problem from resorption, usually caught at a routine kitten exam.
• Senior cats carry more dental disease on average from years of exposure, and are also the group where anesthesia safety gets the most attention — expect pre-procedure bloodwork to confirm organ function.
• Cats with kidney disease need anesthesia and fluid support managed around that condition specifically, which is why pre-anesthetic bloodwork matters more here than for a young, healthy cat.
• Diabetic cats need blood sugar accounted for around the fasting and anesthesia a dental procedure involves — your vet will plan food and insulin timing around the procedure day.

None of this makes dental care riskier than leaving disease untreated — untreated dental pain and infection carry their own costs — it means the anesthesia plan is more involved and worth discussing directly with your vet.

What to do next

If your cat has bad breath, visible tartar, or any of the eating changes above, book a dental exam rather than waiting for the annual visit to come around. If a lesion is found, ask your vet to walk you through the staging and why extraction — which sounds drastic but is usually the treatment that actually removes the pain — is or isn't recommended for that specific tooth.