Feline chronic gingivostomatitis (FCGS) is a severe, painful oral inflammatory condition in which the immune system attacks the gums and oral mucosa. Most affected cats do not respond fully to dental cleaning and antibiotics alone; many require extraction of most or all teeth to achieve remission. With appropriate treatment, the majority of cats experience dramatically reduced pain.
Last reviewed: June 2026
What Is Cat Stomatitis?
Feline chronic gingivostomatitis — often shortened to stomatitis — is a severe immune-mediated inflammatory condition affecting the gums (gingivae), the tissues at the back of the mouth (caudal mucosa), and sometimes the tongue and cheeks. Unlike ordinary periodontal disease, stomatitis involves bright red, proliferative, ulcerated tissue that bleeds easily and causes extreme pain. Many affected cats cannot eat comfortably, paw at their mouths, drool excessively, and show dramatic weight loss.
The exact cause remains under investigation, but the current understanding, as described in Ettinger's Textbook of Veterinary Internal Medicine, is that affected cats mount an abnormal immune response to plaque and dental biofilm — and in some cases to feline calicivirus (FCV) antigens. This is why conventional periodontal treatment alone often fails: even with excellent dental hygiene, the persistent immune response to residual antigens drives ongoing inflammation.
Signs of Stomatitis in Cats
- Severe, persistent bad breath (halitosis) — noticeably stronger than typical cat breath
- Reluctance to eat or complete food aversion — dropping food, preferring soft food, eating on one side
- Pawing at the mouth or face
- Excessive drooling, sometimes blood-tinged
- Weight loss from reduced food intake
- Unkempt coat because grooming is painful
- Bright red, proliferative tissue visible at the back of the mouth or along the gumline
Signs typically worsen over months to years if untreated. Many owners describe their cat as "just getting picky" before realizing the degree of oral pain involved.
How Vets Diagnose and Grade Stomatitis
Diagnosis is clinical, based on oral examination under sedation or anesthesia. The WSAVA Global Dental Guidelines, 2017 recommend full-mouth dental radiographs as part of the evaluation — they reveal whether tooth root remnants are present (a common driver of continued inflammation), assess bone loss, and guide extraction decisions.
Biopsies of caudal mucosa are sometimes taken to rule out other causes of oral inflammation, including squamous cell carcinoma, which can look similar in older cats. Blood testing assesses kidney function (important before anesthesia), and tests for feline leukemia virus (FeLV) and FIV are typically included because both retroviral infections can complicate immune-mediated disease.
Treatment: Why Extraction Is Often the Answer
Full-mouth or near-full-mouth tooth extraction is the most effective long-term treatment for FCGS. Approximately 60–80% of cats improve significantly or achieve complete remission after removal of all or most teeth. The rationale: removing the teeth removes the primary surface on which bacterial biofilm accumulates, reducing the antigenic stimulus that drives the immune response.
Cats adapt remarkably well to life without teeth — many eat dry food without difficulty once the pain of the disease is resolved.
Medical management — antibiotics (often metronidazole or doxycycline), corticosteroids, cyclosporine, or interferon — can reduce inflammation temporarily but rarely achieves durable remission without extraction in severe cases. Cyclosporine has shown the most promise as an immunomodulatory option.
Feline interferon omega has been used in some countries with variable results and is considered an adjunct therapy.
According to the AAHA Dental Care Guidelines, 2019, a comprehensive oral health assessment and treatment plan — including dental radiographs and extraction of affected teeth — is the foundation of appropriate care for cats with severe oral inflammatory disease.
What Does Treatment Cost?
Initial evaluation with bloodwork, FeLV/FIV testing, and dental radiographs under anesthesia typically runs $400–800. Partial extraction (most affected teeth) costs $800–1,500. Full-mouth extraction is $1,200–2,500 depending on complexity, geographic location, and whether a dental specialist performs the procedure. Post-operative pain medications and antibiotics add $50–150. Cyclosporine, if used long-term, runs $80–200/month.
When to See a Vet
Call your vet today if:
- Your cat is dropping food, eating on one side, or refusing meals
- You notice drooling, especially bloody saliva
- Your cat is pawing at its mouth repeatedly
- Bad breath has become noticeably severe
Go to the ER immediately if:
- Your cat has not eaten for more than 24 hours due to mouth pain
- There is significant bleeding from the mouth
- Your cat is extremely weak or unresponsive
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Frequently Asked Questions
Can cat stomatitis go away on its own? No. Feline chronic gingivostomatitis is progressive without intervention. Temporary improvement may occur with antibiotics, but without addressing the underlying immune dysregulation — typically through extraction — the condition returns and worsens. Early treatment produces better outcomes and less suffering.
Do cats need all their teeth removed for stomatitis? Often yes, for severe FCGS. Studies show that 60–80% of cats achieve significant improvement or full remission after full-mouth or near-full-mouth extraction. Cats tolerate toothlessness remarkably well and are able to eat and groom normally once oral pain is resolved.
What's the difference between stomatitis and normal periodontal disease? Periodontal disease causes gingivitis and bone loss around individual teeth, often without dramatic soft tissue changes. Stomatitis involves bright red, proliferative, ulcerated tissue throughout the mouth — especially at the caudal mucosa — that bleeds easily and causes severe pain. Standard dental cleaning alone rarely controls stomatitis.
How much does cat stomatitis treatment cost? Initial evaluation with bloodwork and dental radiographs under anesthesia runs $400–800. Partial extraction costs $800–1,500. Full-mouth extraction ranges $1,200–2,500. Cyclosporine, if needed long-term, adds $80–200/month. Total first-year costs often range $1,500–3,500.
What can I feed a cat with stomatitis? Wet, soft food is easiest to eat when oral pain is present. Pâté-style foods require no chewing. Warming the food slightly increases aroma and palatability. Avoid hard kibble until the mouth is treated. After full extraction, many cats can return to dry food once healing is complete.
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