Feline tooth resorption is a condition in which a cat's own cells break down the hard tissue of a tooth, starting beneath the surface and working outward until the crown fails. It is common, it is painful, and it is diagnosed by a veterinarian using dental radiographs taken under general anaesthesia. No food, chew or supplement treats it.
What resorption means at the level of the tooth
Bone is remodelled constantly by two cell populations, one that builds and one that dissolves. Teeth are not supposed to be on that menu. In resorption, cells called odontoclasts begin dismantling dentine, the layer beneath the enamel, and the process typically begins at or below the gum line where nothing is visible from the outside.
Because the destruction starts internally, a tooth can be substantially undermined while the crown still looks broadly normal. By the time an owner notices a pink or red patch at the gum margin, a notch at the neck of the tooth, or a crown that has simply broken away leaving roots behind, the process has usually been running for a long time. That is the defining feature of this condition and the reason it is so frequently missed at home.
Resorption is not decay in the human sense. There is no bacterial cavity being drilled out and filled. The tissue is being removed by the cat's own biology, which is why the standard human repair approach does not apply and why the veterinary answer is usually extraction rather than restoration.
How common it is, and in which cats
Resorption is one of the most frequently diagnosed dental conditions in domestic cats. It becomes more likely with age, it affects pedigree and moggy alike, and it is regularly found in cats whose owners had no idea anything was wrong. Multiple teeth are often involved, and lesions are commonly found on the opposite side to the one that prompted the appointment.
The cause is not settled. Various hypotheses have been examined over the years, including dietary, inflammatory and metabolic contributions, and none has produced a preventive strategy anyone can sell you. That is an uncomfortable message in a category full of products, and it is the accurate one. Merck's overview of dental disorders in cats sets out the current clinical picture without overstating what is known.
What follows from an unknown cause is that surveillance matters more than intervention. You cannot prevent what nobody knows how to prevent, but you can catch it earlier, and earlier is meaningfully better for the cat.
Why cats hide it so effectively
Cats conceal oral pain to a degree that routinely astonishes owners. A cat with several painful teeth will often continue to eat, groom and behave in ways that look normal, because the behavioural repertoire for advertising discomfort is thin and because eating is not optional.
The signs that do appear tend to be small and easy to explain away. Chewing on one side. Dropping kibble. Preferring wet food where dry was previously fine. A sudden interest in swallowing pieces whole. Pawing at the mouth, head shaking, or a jaw tremor when something touches a lesion, which is a classic finding during a veterinary oral exam. Drooling, sometimes blood tinged. Withdrawal, irritability or reduced grooming producing a scruffier coat than usual.
A cat showing any of these needs a veterinary examination. A cat showing none of them may still have lesions, which is the whole problem, and it is why an annual oral examination is part of a routine health check rather than an optional extra.
What diagnosis actually involves
The anaesthetic is not a convenience or a revenue line. Radiographs require a still patient with precise sensor placement inside the mouth, and probing a painful lesion in a conscious cat is neither humane nor informative. Anaesthesia free dental cleaning cannot deliver any of this, and a cat who receives it may leave with cleaner looking crowns and every one of their painful lesions intact and undiagnosed.
Treatment is surgical. Depending on what the radiographs show, that means extracting the affected tooth or, for certain radiographic types where the root is already being replaced by bone, amputating the crown and leaving the root. Cats do extremely well after extractions, including full mouth extractions, and owners frequently report that the cat became brighter, more sociable and more active afterwards, which is often the first clear evidence of how much pain had been there.
Where daily dental care fits, and where it does not
Home dental care targets plaque and tartar at the gum line. That is worth doing, because the accumulation of plaque and the inflammation it drives are part of the broader oral health picture for cats. It is not, and cannot be, a way to influence resorption, because the mechanism has nothing to do with surface deposits.
That distinction should govern how any dental product for cats is described. Ark Naturals Kiss Me-Ow Cleaning Dental Chews are chews built around a toothpaste centre with a crunchy outer texture, offered in chicken and tuna, in a snack size and a full size. Ark describes them as helping reduce plaque and tartar. They are a daily cleaning habit for a cat who will accept one, in the same category as brushing and dental wipes.
They do not treat resorption. Ark makes no such claim, no chew could, and no seal or certification from any body would change that, because the target of a cleaning product and the mechanism of resorption do not overlap. Ark does not claim a Veterinary Oral Health Council seal for Kiss Me-Ow or for any of its chews, and any suggestion otherwise should be treated with suspicion.
It is also worth being realistic about what a cat will accept. A proportion of cats will take a dental chew readily, a proportion will treat it as an insult, and no oral care routine survives a cat who has decided against it. Whatever your cat tolerates consistently beats whatever is theoretically best and refused on day three, and your veterinary nurse is a good source of practical suggestions for introducing any of it.
Vet first, always, for anything in a cat's mouth
Book an appointment now rather than watching and waiting if your cat drops food, chews on one side, has started refusing dry food, drools, paws at their face, shakes their head while eating, has visible red tissue growing over a tooth, has bad breath, or has a tooth that appears broken or missing. Weight loss, hiding, reduced grooming and a change in temperament all belong on that list too, because in cats these are frequently pain signals rather than personality.
Never attempt to examine, probe or treat a suspected lesion at home. Never use human dental products on a cat, and never give a cat human pain medication, because several common analgesics are seriously toxic to the species. Ask your veterinarian about pain relief, about anaesthetic safety if your cat is elderly or has kidney, thyroid or heart disease, and about when the next set of radiographs should be taken, since resorption often appears in new teeth over time.
Frequently asked questions
How do I know if my cat has tooth resorption?
You usually cannot know from home, and that is the central difficulty. Lesions begin below the gum line, cats hide oral pain well, and many affected cats eat normally. Diagnosis requires a veterinary oral examination with full mouth dental radiographs taken under general anaesthesia, which is the only way to see what is happening to the roots.
Is tooth resorption painful for cats?
Yes. Once the process exposes dentine, the tooth becomes sensitive, and advanced lesions are recognised as a significant source of pain. The jaw tremor many cats show when a lesion is touched during an examination is a direct indication of that sensitivity, and owners often notice a cat becoming visibly happier after affected teeth are removed.
Can brushing or dental chews prevent tooth resorption?
No. The cause of resorption is not established and no product has been shown to prevent it. Brushing and dental chews are worthwhile for managing plaque and tartar, which is a separate part of feline oral health, but they do not act on the process that dissolves tooth structure from within.
Will my cat be able to eat after extractions?
Almost always, yes, and often better than before. Cats adapt remarkably well to missing teeth, including to full mouth extractions, and most return to eating dry food. Your veterinary team will advise on soft food during healing and on pain relief for the recovery period.
How often should my cat's teeth be checked?
At minimum at every routine health examination, which for most adult cats means annually and for seniors often twice a year. Your veterinarian will advise when a full assessment under anaesthesia with radiographs is warranted, and that recommendation should not be deferred on the basis that the cat seems fine, because seeming fine is what cats do.
Related reading: Why Is One of My Dog's Teeth Turning Gray?