When to see a vet urgently
Contact a vet promptly if your cat has any of the following:
- Refusal to eat or obviously painful chewing.
- Swelling of the face or beneath the eye, or pus draining through the skin.
- Heavy bleeding from the mouth or severe pain from a damaged tooth.
Do not wait for a tooth to fall out by itself. You can find a vet near you.
Overview
Periodontal disease develops gradually: soft plaque mineralises into tartar, which damages the gums and provides a source of bacteria. The resulting inflammation progresses without treatment and leads to tooth loss. Oral infections can also spread through the bloodstream and affect the heart, kidneys and liver.
Plaque is a bacteria-containing layer that builds up on tooth surfaces. Tartar provides a rough surface for it to attach to, but inflammation is caused primarily by the tissues' response to the bacterial layer. Little visible tartar therefore does not guarantee healthy tissues below the gumline, and removing visible deposits alone does not solve every problem.
Gingivitis can resolve when plaque and other factors maintaining inflammation are controlled. With periodontitis, supporting tissues and bone have already been lost. Ordinary brushing cannot reverse this structural loss, although treatment can support the health of the remaining tissues.
Associations between oral and wider health have been observed, but a simple claim that oral bacteria cause distant organ infections does not describe every case. Persistent inflammation may be part of the picture. The cause of an individual cat's heart, liver or kidney disease cannot be inferred from the amount of tartar.
Causes
The main causes of periodontal disease in cats include:
- Tartar formation: mineralised plaque.
- Inadequate oral hygiene.
- Feeding only soft food.
- An inherited predisposition, more often in Persian and British cats.
- Chronic oral inflammation.
- A weakened immune system.
- Age-related changes.
This list does not mean soft food alone causes periodontitis. Alongside feeding, plaque, tooth position, home care and the individual inflammatory response matter. Using ordinary dry food instead of wet food does not replace plaque removal or necessary dental care.
Breed and inherited predisposition can provide background information, but a named breed does not establish disease on its own. Crowded teeth, for example, may be harder to clean. Young cats can also have significant gingivitis, so oral examinations should begin before old age.
Risk factors
Periodontal disease is more common in cats that:
- Are over three years old.
- Have tartar.
- Eat wet food or table food.
- Do not receive regular dental care.
- Have chronic illnesses, such as diabetes or kidney failure.
Age thresholds are approximate and do not describe an individual cat's mouth. Concurrent problems such as diabetes or kidney disease are considered, but their presence does not replace a dental examination. Treatment and anaesthesia for a chronically ill cat are planned according to the whole situation.
Main symptoms
Periodontal disease causes the following signs:
- Bad breath.
- Red, swollen gums.
- Bleeding during eating or examination.
- Excessive salivation.
- Pain when chewing and avoidance of hard food.
- Loose teeth and tooth loss.
- Pus-draining tracts in severe periodontitis.
A cat may eat despite oral pain. It may swallow food with less chewing, drop pieces or chew on one side only. Face rubbing, avoiding head handling or changed food preferences may also indicate pain. A normal appetite alone therefore does not rule out disease.
Bad breath does not identify which tooth or tissue is affected. A fractured tooth, tooth resorption (breakdown of dental tissue) or more widespread mouth inflammation can cause similar symptoms. These may coexist with periodontal disease but need separate assessment and sometimes different treatment.
Complications and consequences
Without treatment, periodontal disease can lead to:
- Tooth loss.
- Chronic oral infections.
- Abscesses.
- Spread of infection to internal organs, causing endocarditis, nephritis or hepatitis.
- Chronic pain and weight loss; studies also associate severe periodontitis with kidney disease.
Not every cat develops the listed systemic illnesses. The observed association between periodontitis and kidney disease does not, on its own, prove that oral infection caused kidney damage. The clear practical aims of dental care are to remove pain and sources of inflammation and preserve a functional mouth, rather than promise prevention of every internal organ disease.
Diagnosis at the vet
Diagnosis is based on:
- Visual examination of the mouth.
- Dental examination under anaesthesia.
- Dental X-rays to assess bone tissue.
An awake examination provides an initial view of redness, tartar and possible damage. However, not every tooth surface, root or structure beneath the gumline is visible. A clean-looking crown alone therefore does not establish health, and the full findings may become clear only under anaesthesia.
Teeth are assessed individually. The vet measures periodontal pockets, checks tooth mobility and records supporting tissue changes. Intraoral X-rays show roots, bone loss and other hidden damage. This information guides decisions about which teeth can be preserved and which would remain sources of pain or infection without treatment.
Anaesthesia allows accurate examination and treatment while the patient stays still. General condition and necessary blood tests are assessed beforehand, and anaesthesia is monitored throughout. Cleaning visible surfaces in an awake cat does not equal this assessment and treatment or reveal what is happening below the gumline.
Treatment
Treatment includes removing plaque and tartar below the gumline as well as above it, and treating tooth surfaces according to the findings. Extraction may be necessary if substantial supporting tissue has been lost. The goal is a comfortable, functional mouth; retaining a loose or infected tooth does not always serve the cat's welfare.
Pain relief is planned before and after treatment. Antibiotics do not replace plaque removal, treatment of damaged tissue or necessary extraction. They are not usually needed routinely for every dental procedure. The decision depends on the patient and the nature of infection, rather than the visible amount of tartar alone.
If a dental pus-draining tract opens onto the skin, cleaning the skin site alone does not address the cause. The underlying tooth and surrounding bone are examined. Swelling that temporarily settles with medication still needs the agreed further treatment, because a damaged tooth may sustain the problem.
Recovery and home monitoring
Discharge instructions cover pain relief, food and handling the mouth. Do not start brushing a surgical area before you have permission. Contact the practice if your cat will not eat or still seems painful. More extensive procedures may require additional nutritional support to prevent prolonged inadequate intake.
Also monitor drooling, mouth rubbing, bleeding and facial swelling. Report difficulties giving medication rather than changing it yourself. Follow-up checks recovery and establishes long-term monitoring of the remaining teeth.
Prognosis
Gingivitis may respond well to treatment, but the supporting tissue loss caused by periodontitis requires long-term management. Professional treatment and home care complement one another. One cleaning does not stop plaque accumulating again, and progression is assessed through oral examinations rather than breath odour alone.
Prevention
Recommended measures to prevent periodontal disease include:
- Regular brushing with toothpaste intended for animals.
- Vet-recommended dental diets and treats with documented effectiveness, identified by the VOHC seal. Ordinary dry food does not clean teeth.
- Special treats and toys for mechanical cleaning of teeth.
- Regular veterinary dental examinations.
- Professional ultrasonic cleaning when needed.
Introduce brushing when the mouth is pain-free and the vet considers it appropriate. Progress gently from accepting touch to using a brush, rewarding cooperation. Use a suitable soft brush and toothpaste intended for cats. Do not use human toothpaste.
Brushing removes soft plaque, but established tartar must not be scraped off at home. Pay attention to the tooth surfaces facing the cheeks too. If gums bleed or pain makes your cat resist, seek assessment before continuing. The technique is adapted to your cat's mouth and previous treatment.
Dental foods and other products are chosen for their demonstrated ability to reduce plaque or tartar. They do not replace necessary examination or every benefit of brushing. Do not offer hard chews or unsuitable toys in the name of mechanical cleaning, because a tooth may fracture. Cats that cannot tolerate a brush also need an individual home care plan.
What it means for owners
Periodontal disease is common in cats, but appropriate prevention can keep it well controlled. Dental care is more than cosmetic: it protects against pain, infections and systemic complications.
Frequently asked questions
Can my cat have oral pain while still eating?
Yes. Cats may keep eating despite difficult chewing. Dropping food, chewing on one side and avoiding head handling are useful observations to report to the vet.
Can brushing cure established periodontitis?
It helps control plaque, but cannot restore lost supporting tissue or remove tartar. Periodontitis needs professional examination and treatment based on the findings.
Are antibiotics always needed for dental treatment?
No. The key is treating the local cause maintaining inflammation. Antibiotic needs are decided individually; they do not replace necessary cleaning or extraction.
Does ordinary dry food protect teeth adequately?
It is not considered a substitute for dental care. Any dental diets and products are chosen for demonstrated effectiveness and combined with appropriate home care and monitoring.
This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.
Paw4care editorial team
Sources
- Feline Dental Disease, Cornell Feline Health Centre, accessed 2026-11-05.
- 2025 FelineVMA feline oral health and dental care guidelines, Journal of Feline Medicine and Surgery, accessed 2026-11-05.
- Clarification of the impact of periodontal health on systemic health, AAHA, accessed 2026-11-05.
- Recommending home oral hygiene and products, AAHA, accessed 2026-11-05.
- Dental X-Rays in Cats, VCA Animal Hospitals, accessed 2026-11-05.
- Brushing, Veterinary Oral Health Council, accessed 2026-11-05.
- Tooth Root Abscess in Cats, VCA Animal Hospitals, accessed 2026-11-05.