CONDITION

Dental Disease in Cats

A progressive condition affecting teeth and oral tissues in cats that often develops silently and alters eating behaviour.

Why this matters now

Dental disease is one of the most prevalent health conditions in cats, with studies suggesting that the majority of cats over three years of age show some degree of dental pathology. The spectrum of feline dental disease includes periodontal disease (inflammation and infection of the supporting structures of the teeth), tooth resorption (a distinctly feline process of progressive tooth destruction), and stomatitis (severe inflammation of the oral mucosa). Tooth resorption, formerly known as feline odontoclastic resorptive lesions (FORLs), affects an estimated 20-60% of cats depending on the population studied and the method of detection, with prevalence increasing with age. Unlike dogs, where periodontal disease tends to be the dominant dental condition, cats frequently experience tooth resorption either alone or concurrently with periodontal disease, making feline dental pathology a somewhat distinct clinical entity. The condition may develop and progress without obvious external signs, as cats are often adept at concealing oral discomfort, meaning that significant dental disease may be present before owners become aware of any problem.

Dental disease in cats tends to progress gradually, often over months to years, though the rate and pattern of progression vary depending on the type of pathology involved. Periodontal disease begins with bacterial biofilm (plaque) accumulation on tooth surfaces, which triggers an inflammatory response in the gingival tissues (gingivitis) that may progress to involve the deeper periodontal structures — the periodontal ligament, cementum, and alveolar bone — resulting in periodontitis and potential tooth loss. Tooth resorption typically begins on the root surfaces below the gum line, where odontoclast cells progressively dissolve the tooth structure; as the lesions advance, they may extend to involve the crown, eventually causing tooth fracture or complete destruction. Feline chronic gingivostomatitis represents a particularly challenging form of dental disease characterised by severe, painful inflammation of the oral mucosa that often extends beyond the gingiva to involve the caudal oral cavity, and which may follow a relapsing course despite management. The progression of each form of dental disease is influenced by individual immune response, oral bacterial populations, concurrent systemic conditions, and genetic predisposition.

Signals & patterns

Early signals

Subtle changes in eating behaviour

Cats with early dental disease may show slight alterations in how they approach food rather than refusing to eat altogether. This can manifest as a preference for softer foods, eating more slowly, chewing predominantly on one side of the mouth, or dropping food from the mouth during chewing. Some cats may approach the food bowl with apparent enthusiasm but then eat tentatively or walk away before finishing, creating a pattern of increased interest coupled with reduced intake. These changes may develop so gradually that they are difficult to distinguish from normal eating variation.

Halitosis

An unpleasant odour from the mouth — often described as a distinct sourness or strong smell noticeable during close contact — can be an early indicator of bacterial accumulation, gingival inflammation, or developing periodontal disease. The odour arises from volatile sulphur compounds and other metabolic byproducts produced by anaerobic bacteria within dental plaque and periodontal pockets. While some degree of oral odour may be considered normal, a noticeable increase or change in the character of the breath can reflect progression of oral bacterial colonisation and tissue inflammation.

Mild gingival redness

Gingivitis — inflammation of the gum tissue — may be visible as a thin red line along the gum margin where it meets the teeth, or as more diffuse redness and swelling of the gingival tissue. In its early stages, gingivitis is potentially reversible if the bacterial challenge is addressed, but it can progress to involve the deeper periodontal structures if left unmanaged. Owners may notice the redness during play, yawning, or when the cat is grooming, though many cats are reluctant to allow detailed oral inspection.

Increased salivation or drooling

Some cats with developing dental disease may produce more saliva than usual, which may be noticed as dampness around the chin and lower jaw, wet forepaws from excessive facial grooming, or occasional drool marks on bedding or furniture. This hypersalivation can reflect oral discomfort or irritation from inflamed gingival tissue, exposed tooth surfaces, or mucosal lesions. The drooling may be intermittent rather than constant, sometimes occurring primarily during or after eating.

Reduced grooming

Cats experiencing oral discomfort may gradually reduce the frequency or thoroughness of their self-grooming, as the act of grooming involves significant use of the tongue, teeth, and oral structures. This may manifest as a coat that appears less well-maintained, matting in areas that the cat previously kept well-groomed, or a generally duller coat texture. The change can be subtle and may be attributed to ageing or other factors rather than recognised as potentially related to oral discomfort.

Later signals

Visible tooth damage or discolouration

As tooth resorption advances to involve the crown (the visible portion of the tooth), lesions may become visible as pink, red, or grey areas on the tooth surface where enamel and dentine have been destroyed and granulation tissue has proliferated. Affected teeth may show areas of irregularity, notching, or crumbling, and may fracture at the crown leaving a residual root fragment beneath the gum line. Calculus (tarite) accumulation may also become visually apparent as yellow-brown deposits on tooth surfaces, particularly on the outer surfaces of the upper premolars and molars.

Pawing at the mouth or facial sensitivity

Cats with advanced dental disease may paw at their mouths, rub their faces against surfaces, or show sensitivity when touched around the jaw or cheeks. Some cats may resist having their heads touched or show a head-shy behaviour that was not previously present. In cases of tooth resorption where the sensitive dentine or pulp is exposed, the pain can be acute and may trigger a dramatic jaw-chattering response when the affected tooth is contacted during eating or examination.

Difficulty eating or food avoidance

More advanced dental disease may result in a cat struggling to pick up or chew food, making exaggerated or unusual jaw movements during eating, vocalising during meals, or showing a marked preference for only very soft or liquid foods. Some cats may refuse dry food entirely while still accepting wet food, or may swallow food whole rather than chewing. Weight loss may develop if the oral discomfort significantly reduces food intake over a prolonged period, though many cats adapt their eating technique to accommodate dental pain for extended periods before more obvious signs develop.

Oral bleeding

Blood-tinged saliva, small amounts of blood on food or water bowls, or occasional blood spots on bedding may indicate advanced periodontal disease, exposed tooth resorption lesions, or ulcerated oral mucosa. The bleeding typically results from friable (easily damaged) inflammatory tissue within deep periodontal pockets, from granulation tissue filling resorptive lesions, or from ulcerated mucosal surfaces in cats with stomatitis. In cats with chronic gingivostomatitis, the oral mucosa may become severely inflamed, proliferative, and prone to spontaneous bleeding.

Click to read about the biological mechanisms

How this is usually investigated

Investigation of dental disease in cats typically requires a combination of conscious oral examination, dental radiography performed under general anaesthesia, and thorough periodontal probing of each tooth. The full extent of feline dental disease — particularly tooth resorption and periodontal bone loss — is frequently underestimated from conscious examination alone, as much of the pathology occurs below the gum line and on root surfaces.

Conscious oral examination

Purpose: An initial assessment of the mouth performed while the cat is awake can provide preliminary information about visible dental disease, gingival health, and the presence of obvious lesions. This examination may reveal calculus accumulation, gingivitis, visible tooth resorption lesions on crown surfaces, missing teeth, oral masses, and the general state of the oral mucosa. However, the limitations of conscious examination in cats are significant — many cats resist thorough oral inspection, and much of the relevant pathology (particularly root resorption, periodontal pocket depth, and early lesions) is not detectable without anaesthesia, dental radiography, and periodontal probing.
Considerations: The conscious oral examination provides an incomplete picture and may significantly underestimate the extent and severity of dental disease present. Cats with painful mouths may be particularly resistant to examination, making adequate visualisation difficult. The examination is most valuable as a screening tool to identify the need for a comprehensive dental assessment under anaesthesia rather than as a definitive diagnostic procedure.

Full-mouth dental radiography

Purpose: Intraoral dental radiographs taken under general anaesthesia provide essential information about tooth root integrity, alveolar bone levels, the presence and type of tooth resorption lesions, periapical pathology, and retained root fragments. Full-mouth radiographic series (typically requiring 6-8 images in cats) are considered the standard of care for feline dental assessment, as studies have shown that a substantial proportion of significant dental pathology is only detectable radiographically. Dental radiography can distinguish between Type 1 and Type 2 tooth resorption, which influences the treatment approach, and can identify teeth with root pathology that appear clinically normal above the gum line.
Considerations: Dental radiography requires general anaesthesia and specialised intraoral radiographic equipment (either digital sensors or dental film with appropriate positioning devices). The interpretation of feline dental radiographs requires familiarity with normal feline dental anatomy and the radiographic appearances of various pathologies. Some radiographic changes can be subtle, and comparison between different teeth and between serial radiographs over time may be necessary for complete interpretation. The additional time under anaesthesia for full-mouth radiography is generally minimal and is widely considered justified by the diagnostic information gained.

Periodontal probing

Purpose: Systematic probing of the gingival sulcus around each tooth using a calibrated periodontal probe measures pocket depth, identifies areas of gingival recession, detects furcation involvement in multi-rooted teeth, and assesses tooth mobility. In healthy cats, the gingival sulcus depth is typically 0.5-1mm; increased depths indicate periodontal pocket formation resulting from loss of the periodontal attachment. Probing can also detect crown lesions from tooth resorption that may not be visually apparent, particularly those concealed by hyperplastic gingival tissue growing over the resorptive defect.
Considerations: Periodontal probing requires general anaesthesia to perform accurately and without causing distress, and must be performed gently to avoid damaging inflamed tissues. The findings are recorded on a dental chart that maps the condition of each tooth and its surrounding tissues, creating a detailed record that can be compared over time. Probing findings are most informative when combined with dental radiographic findings, as the two modalities provide complementary information about the above-gum-line and below-gum-line components of dental disease.

Pre-anaesthetic blood work

Purpose: Blood testing performed before dental procedures serves to assess the cat's general health status, identify concurrent conditions that may affect anaesthetic safety, and screen for systemic disease that could be contributing to or compounding the dental pathology. This typically includes a complete blood count, biochemistry panel (assessing kidney function, liver enzymes, blood glucose, and electrolytes), and sometimes thyroid hormone levels in older cats. The results help inform anaesthetic protocols, identify conditions requiring concurrent management, and occasionally reveal systemic disease that explains or exacerbates the oral pathology.
Considerations: While pre-anaesthetic blood work is standard practice, normal results do not eliminate all anaesthetic risk, and abnormal results do not necessarily preclude dental treatment but may prompt modifications to the anaesthetic protocol or concurrent therapeutic interventions. In cats with chronic gingivostomatitis, blood work may also include testing for feline immunodeficiency virus (FIV) and feline leukaemia virus (FeLV), as these retroviral infections can influence the oral immune response and may affect the management approach.

Biopsy of oral lesions

Purpose: In cases where oral lesions appear atypical, fail to respond to standard treatment, or raise concern for neoplastic (cancerous) processes, biopsy of affected tissue may be performed for histopathological examination. This is particularly relevant in cats with oral masses, unusual mucosal proliferations, or lesions that do not conform to the expected patterns of common dental diseases. Biopsy can differentiate between inflammatory, reactive, and neoplastic processes, which is essential for guiding appropriate management.
Considerations: Biopsy is not routinely performed for typical dental disease presentations but is an important tool when the clinical picture raises diagnostic uncertainty. The procedure is usually performed under the same anaesthetic as the dental assessment, adding minimal additional time and risk. Adequate tissue sampling (including tissue at the margin between normal and abnormal areas) is important for accurate histopathological interpretation, and results may take several days to weeks depending on the laboratory.

Options & trade-offs

Management of dental disease in cats varies according to the type and severity of pathology, the cat's overall health status, and individual factors that influence both the disease process and the cat's tolerance of intervention. The approaches range from preventive strategies to surgical treatment, and the choice between them is influenced by the specific diagnosis, the stage of disease, and the practicalities of each approach in the context of the individual cat.

Professional dental cleaning (prophylaxis)

Professional dental cleaning under general anaesthesia involves ultrasonic and hand scaling to remove calculus and plaque from all tooth surfaces (both supragingival and subgingival), followed by polishing to smooth the enamel surfaces and reduce subsequent plaque accumulation. Subgingival scaling — cleaning beneath the gum line within periodontal pockets — is the therapeutically important component, as it addresses the bacterial biofilm most directly contributing to periodontal disease progression. The procedure is typically combined with full-mouth radiography, periodontal probing, and treatment of any pathology identified during the assessment.

Trade-offs: Professional dental cleaning requires general anaesthesia, which carries inherent considerations particularly in older cats or those with concurrent health conditions. The procedure addresses existing calculus and plaque but does not prevent future accumulation, so the interval between professional cleanings varies depending on the individual cat's rate of plaque formation and the effectiveness of any home care measures. The cost encompasses anaesthesia, the dental procedure itself, dental radiography, and any additional treatments identified as necessary during the assessment.

Tooth extraction

Extraction is the primary treatment for teeth affected by tooth resorption, teeth with advanced periodontal disease that has progressed beyond the point of salvageability, and fractured teeth with pulp exposure. For Type 1 tooth resorption lesions, standard surgical extraction (involving raising a gingival flap and removing the entire tooth and root) is typically performed. For Type 2 lesions where the roots have undergone replacement resorption and are ankylosed to the surrounding bone, crown amputation (removing the visible crown and allowing the resorbing root remnants to continue their replacement by bone) may be an appropriate alternative when radiographs confirm complete root replacement. Extraction of teeth affected by periodontitis removes the source of chronic infection and eliminates the associated discomfort.

Trade-offs: Tooth extraction is a surgical procedure that requires adequate anaesthetic time and surgical skill, particularly for multi-rooted teeth or teeth with complex root anatomy. Post-operative discomfort is generally manageable and typically resolves within a few days, with most cats showing improved comfort and eating behaviour once the source of pain has been removed. Multiple teeth may require extraction in a single session, and in some cases extensive extractions may be necessary, though cats generally adapt remarkably well to eating with reduced or absent dentition. The decision to extract versus attempt to preserve a tooth involves weighing the long-term prognosis for that tooth against the intervention required.

Full-mouth or near-full-mouth extractions (for stomatitis)

For cats with feline chronic gingivostomatitis that is refractory to other management approaches, extraction of all premolar and molar teeth (and sometimes all teeth including incisors and canines) may be considered. The rationale is that removing the teeth eliminates the tooth surfaces on which bacterial biofilms form, thereby reducing the antigenic stimulus that drives the exaggerated inflammatory response. Studies report that approximately 60-80% of cats with stomatitis show significant clinical improvement following full-mouth extractions, with a proportion achieving complete resolution of inflammation. Some cats show partial improvement, and a smaller proportion may continue to experience significant stomatitis despite tooth removal.

Trade-offs: Full-mouth extraction is a major surgical procedure requiring extended anaesthesia time and considerable surgical skill, and the post-operative recovery period may involve several days to weeks of adjusted feeding and pain management. The response to extraction is not guaranteed, and some cats require continued medical management of residual inflammation even after complete tooth removal. The decision to pursue extensive extractions typically follows a period of unsuccessful medical management and involves careful consideration of the individual cat's overall health status, the severity of the disease, and the impact on quality of life. Cats that respond well to the procedure typically show dramatic improvement in comfort, appetite, grooming behaviour, and overall demeanour.

Home dental care

Preventive home dental care aims to slow the accumulation of plaque on tooth surfaces, thereby reducing the rate of periodontal disease progression. Tooth brushing with a veterinary-specific toothpaste represents the most effective form of home dental care, though its practicality in cats varies considerably depending on the individual cat's temperament and the owner's ability to establish a tolerated routine. Alternative or supplementary approaches include dental diets formulated with specific kibble textures that mechanically reduce plaque, water additives containing antimicrobial agents, dental treats, and oral gels or rinses. The effectiveness of these alternatives generally falls below that of regular tooth brushing but may provide some benefit in cats that do not tolerate brushing.

Trade-offs: The success of home dental care in cats is highly dependent on individual cat acceptance, and many cats prove resistant to tooth brushing despite patient and gradual introduction. Starting dental care routines in kittens or young cats generally improves long-term acceptance. Home dental care slows but does not prevent plaque accumulation, so professional dental assessments remain important regardless of the home care programme. The evidence base for the efficacy of various dental products varies, and products carrying veterinary oral health council (VOHC) acceptance may provide more reliable benefit. Home dental care is not effective against tooth resorption, which has a different pathological mechanism.

Medical management of stomatitis

Medical approaches to feline chronic gingivostomatitis may include anti-inflammatory medications (corticosteroids, non-steroidal anti-inflammatory drugs), immunomodulatory therapies (ciclosporin, interferon), antimicrobial therapy for secondary bacterial infection, and pain management. These approaches may be used as primary management in cases where extraction is not immediately feasible or as adjunctive therapy before or after surgical intervention. Some cats achieve adequate disease control with medical management, though many require ongoing or intermittent treatment to maintain comfort.

Trade-offs: Long-term corticosteroid use carries risks of side effects including diabetes mellitus, immunosuppression, and other metabolic consequences. Immunomodulatory drugs such as ciclosporin require regular monitoring and may have their own side-effect profiles. Medical management often provides symptom control rather than disease resolution, and the chronic nature of stomatitis means that treatment may need to continue indefinitely. The response to medical management varies considerably between individual cats, and some cats develop refractory disease that no longer responds to previously effective medications, necessitating reassessment of the management approach.

Common misconceptions

Misconception:

"If a cat is still eating, its teeth and mouth must be fine."

Reality:

Cats are remarkably adept at continuing to eat despite significant oral pain and dental pathology. The survival instinct to maintain food intake is strong, and many cats with advanced tooth resorption, severe periodontal disease, or even stomatitis continue to eat — albeit sometimes with subtle modifications to their eating technique that may go unnoticed. Studies have shown that cats can harbour extensive dental disease including multiple resorptive lesions and deep periodontal pockets while showing minimal outward signs to their owners. Maintained appetite is therefore an unreliable indicator of oral health in cats, and dental assessment based solely on eating behaviour can significantly underestimate the extent of disease present.

Misconception:

"Cats that lose most or all of their teeth will be unable to eat properly."

Reality:

Cats that undergo extensive or full-mouth extractions typically adapt to eating without teeth far more successfully than many owners anticipate. The feline tongue is a remarkably strong and dexterous organ that enables cats to manage food effectively even without teeth, and most cats continue to eat both wet and dry food after dental extractions. Many cats actually show improved appetite and enthusiasm for food following extraction of painful teeth, as the elimination of oral pain removes a significant barrier to comfortable eating. The transition period immediately after surgery may require softer food, but long-term dietary restrictions are rarely necessary.

Misconception:

"Dental disease in cats is primarily a cosmetic issue related to tartar buildup."

Reality:

While visible calculus (tartar) on tooth surfaces is the most externally obvious sign of dental disease, it represents only the tip of the iceberg. The clinically significant pathology in feline dental disease typically occurs below the gum line — in the form of periodontal pocket formation, alveolar bone loss, root resorption, and periapical infection — where it is invisible to external inspection. Tooth resorption, which is one of the most common and painful feline dental conditions, frequently begins on root surfaces beneath the gum line and may be well advanced before any crown involvement becomes visible. The systemic implications of chronic oral infection, including the potential for bacteraemia and the inflammatory burden of chronic periodontal disease, extend the significance of dental disease beyond the oral cavity itself.

Dental disease in cats often develops silently, and understanding the range of conditions that can affect the feline mouth — from periodontal disease to tooth resorption to stomatitis — can help in recognising subtle changes in eating behaviour, grooming habits, or oral comfort that might otherwise be overlooked. The fact that cats frequently continue to eat despite significant oral pathology means that maintained appetite alone may not be a reliable indicator of oral health. Building awareness of the signs that may accompany dental disease, and understanding that much of the relevant pathology lies below the gum line where it can only be assessed under anaesthesia, contributes to a more complete picture of this common but often underappreciated aspect of feline health.

Last reviewed: 24 April 2026 · Dr Alastair Greenway MRCVS