CONDITION
Tooth Resorption
Tooth resorption involves progressive destruction of tooth structure, commonly affecting cats over five years of age and often causing significant oral discomfort.
Why this matters now
Tooth resorption often develops gradually in middle-aged and older cats, with feline health specialists at Cornell University estimating that close to three-quarters of cats aged five and older are affected. The condition typically progresses silently until discomfort becomes apparent through changes in eating behaviour or facial sensitivity.
The resorptive process begins at the root surface and advances into the crown. Early lesions may show no external signs, but as erosion progresses, the tooth weakens and exposes sensitive tissue. Without intervention, affected teeth can fracture or become a source of ongoing oral pain.
Signals & patterns
Early signals
Subtle chewing changes
Cats may favour one side when eating or drop food more often, reflecting early oral discomfort.
Increased jaw chattering
Sudden jaw movements during eating or grooming can indicate tooth sensitivity.
Mild drooling
Occasional drooling, sometimes with a slightly pink tinge, may appear as lesions develop.
Reduced interest in dry food
A preference shift towards softer foods can reflect dental discomfort.
Later signals
Head shaking while eating
More pronounced reactions during meals suggest advancing tooth damage.
Visible tooth damage
Pink or red tissue may become visible where enamel has eroded.
Facial sensitivity
Cats may resist having their face or jaw touched.
Click to read about the biological mechanisms
How this is usually investigated
Diagnosing tooth resorption requires careful oral examination under general anaesthesia, combined with dental radiography to reveal lesions beneath the gumline.
Visual oral examination
Dental probing
Dental radiographs
Full oral assessment under anaesthesia
Options & trade-offs
Management typically centres on extraction of affected teeth, though the approach varies based on lesion type and root integrity.
Full tooth extraction
Complete removal of affected tooth and roots when structure permits
Trade-offs: Eliminates pain source; requires anaesthesia and skilled technique; longer procedure.
Crown amputation
Removal of the crown, leaving the resorbing roots in place, only for radiographically confirmed Type 2 lesions (roots being replaced by bone) with no periodontitis, endodontic disease or stomatitis
Trade-offs: Less invasive for fused roots; reduces procedure time; not suitable for other lesion types, where full extraction is used.
Pain management alone
Palliative care when extraction poses unacceptable anaesthetic risk
Trade-offs: Provides comfort but does not address underlying disease; may require ongoing medication.
Regular monitoring
Watchful observation of early, asymptomatic lesions
Trade-offs: Delays intervention; requires annual oral examinations under general anaesthesia with full-mouth radiographs, because progression cannot be judged at home; lesions typically progress.
Common misconceptions
"Tooth resorption only affects old cats"
Tooth resorption becomes more common with age, but International Cat Care describes resorptive lesions as common in both young and old cats.
"Cats show obvious signs when teeth hurt"
Cats often mask dental pain effectively; behaviour changes may be subtle until discomfort becomes severe.
"Brushing prevents tooth resorption"
Tooth resorption is not decay. It usually starts on the root surface and works towards the crown. Oral hygiene can slow resorption driven by gum inflammation (periodontitis), but resorption with no known cause (idiopathic) cannot be prevented.
Related conditions
Dental Disease in Cats
Dental disease and tooth resorption both involve progressive structural changes to teeth and oral tissues in cats, though resorption specifically involves destruction of tooth substance itself rather than periodontal structures. Cats with advanced dental disease may also have concurrent resorptive lesions, complicating the clinical picture.
Arthritis in Cats
Tooth resorption and arthritis both become more common in older cats, and both can show only as subtle behaviour changes rather than overt distress. International Cat Care lists reduced grooming as a sign of both dental disease and arthritis, so the signs of one can overlap with or hide the other.
Chronic Kidney Disease in Cats
Chronic kidney disease and tooth resorption are both common in older cats. A case-control study found higher blood creatinine, a kidney marker, in cats with tooth resorption, but the authors state that this association does not show cause and effect. Both conditions often develop silently over months to years.
Inflammatory Bowel Disease in Cats
Cats with oral pain from tooth resorption may change how they eat, for example by swallowing food without chewing or avoiding dry food, and this can complicate the clinical picture when inflammatory bowel disease is also present. Both conditions can cause weight loss and changes in appetite, though through different mechanisms.
Feline Calicivirus
Feline calicivirus infection can cause oral ulceration and gingivitis, but a study comparing cats with resorptive lesions and unaffected cats found the virus no more often in the affected group, and concluded that calicivirus appears unlikely to play a role in tooth resorption. Both conditions involve oral discomfort and may alter eating behaviour.
Owners noticing changes in their cat's eating habits or facial sensitivity may find it helpful to discuss dental assessment options. Understanding the progressive nature of tooth resorption can inform decisions about timing and approach to oral care.
Last reviewed: 9 October 2026 · Dr Alastair Greenway MRCVS