Moderate severity
Tooth Resorption (Feline Odontoclastic Resorptive Lesions)
The most common dental disease in cats — the body slowly destroys its own teeth from the inside out. Intensely painful, yet easily missed because cats hide it so well.
⚠️ Common symptoms
Tooth resorption — formally called feline odontoclastic resorptive lesions, or FORLs — is the single most common dental disease in domestic cats. Surveys estimate that around a third to a half of all adult cats, and the majority of cats over five, have at least one affected tooth. It is also one of the most painful conditions a cat can suffer, and one of the most easily overlooked, because cats are hardwired to conceal weakness and will keep eating long after a tooth has become agonising.
The disease begins when odontoclasts — cells that normally dissolve bone and shed kitten teeth — start attacking the hard tissue of a permanent tooth. The destruction usually starts at the root or at the "neck" where the tooth meets the gum, then works inward through the cementum, dentine and eventually the sensitive pulp. As the crown weakens it can fracture, and inflamed gum tissue often grows up to cover the defect, producing the tell-tale angry red spot a vet may spot on examination.
What makes resorption so insidious is that most of the damage is invisible to the naked eye. A tooth can look almost normal above the gumline while its root is being eaten away below. This is why dental radiographs are essential: they reveal the true extent of the lesions and determine whether a tooth needs full extraction or, in certain early cases confined to the crown, a crown amputation.
The reason the condition cannot be "filled" like a human cavity is that it is not caused by bacteria eroding enamel from the outside — it is the body's own cells dissolving the tooth from within, and they will simply continue around any filling. The only reliable way to end the pain is to remove the affected tooth. The good news is that cats cope remarkably well with extractions; owners are frequently astonished at how much more playful, affectionate and hungry their cat becomes once the source of chronic pain is finally gone.
🔍 Causes
The exact trigger is still unknown, which is why the disease cannot yet be prevented. Specialised cells called odontoclasts — normally responsible for remodelling bone and baby teeth — begin abnormally dissolving the mineralised tissue of adult teeth, starting at the root or the neck of the tooth and eating inward. Risk rises sharply with age, and cats with prior gingivitis, tartar or periodontal disease have four to five times the odds of developing lesions. Premolars are the most commonly affected teeth.
🛡 Prevention
Because the cause is unknown, resorption itself cannot be reliably prevented — but the strongest known risk factor, existing dental disease, can be reduced. Brush your cat's teeth with pet-safe enzymatic toothpaste, offer dental diets or approved chews, and book professional cleanings so gingivitis and tartar are controlled before they can compound the problem. Above all, schedule regular veterinary dental checks so lesions are caught and treated early, while they are small and less painful.
💊 Treatment
There is no way to save an affected tooth — the lesion is progressive and cannot be filled like a human cavity. The definitive treatment is extraction (or, in specific early cases, crown amputation) under general anaesthetic, always guided by dental X-rays because much of the damage lies hidden below the gumline. Pain relief and a soft diet aid recovery; most cats eat comfortably again within days and are visibly brighter once the painful teeth are gone.
🎬 Related videos
⚕️ Medical disclaimer
- This information is educational only and is not a substitute for veterinary advice.
- Symptoms overlap between conditions — only a vet can diagnose accurately.
- Never withhold treatment or self-medicate based on information found online.
- When in doubt, call your vet. Early intervention almost always leads to better outcomes.