Cat Dental Disease: Why 70% of Cats Have It by Age 3 and What to Do About It

Plaque Turns to Tartar in Under 48 Hours

Bacteria in your cat's mouth form a sticky film on teeth -- plaque -- within hours of eating. If not disturbed, that plaque mineralizes into tartar (calculus) in 24-36 hours. Tartar can't be brushed off; it requires scaling with dental tools. Once tartar forms below the gumline, it creates the conditions for periodontal disease: gum inflammation, pocket formation, and bone loss around the tooth root.

The problem compounds quietly. Cats are stoic about mouth pain. By the time you notice bad breath, reduced appetite, or pawing at the mouth, the disease is often moderate to severe. A cat that drops food while eating or chews only on one side almost certainly has dental pain. Many owners attribute weight loss or reduced appetite in older cats to 'slowing down' when the real cause is a mouth too painful to eat from comfortably.

What a Professional Dental Cleaning Actually Involves

A cat dental cleaning requires general anesthesia -- there's no way to safely scale below the gumline on an awake, moving cat, and the subgingival bacteria causing the disease aren't visible without probing under the gums. Anesthesia-free dental cleanings marketed at groomers or pet stores only remove visible surface tartar. They don't treat disease, and they're often stressful for the cat.

Under anesthesia, the vet uses an ultrasonic scaler to remove tartar above and below the gumline, probes each tooth for pockets, and takes dental X-rays. This is critical: 60% of the tooth is below the gumline and invisible without imaging. Resorptive lesions -- a painful condition unique to cats where the tooth root is being destroyed from inside -- can only be diagnosed on X-ray. Teeth that look intact on the surface may need extraction.

Most cats go home the same day and eat soft food that evening. Pre-anesthetic bloodwork is standard for cats over 7 to check kidney and liver function before administering anesthetics.

Home Care That Actually Prevents Disease

Daily toothbrushing reduces plaque by 60% compared to no brushing, according to AVMA guidelines. Use a finger brush or soft-bristled cat toothbrush with enzymatic toothpaste formulated for cats -- never human toothpaste, which contains fluoride and xylitol at concentrations toxic to cats. The brushing motion at a 45-degree angle to the gumline is what matters; you don't need to brush the inner surfaces if the cat resists.

Start slowly: let the cat lick toothpaste from your finger for a week before introducing the brush. Cats that won't tolerate brushing can benefit from water additives (Vetri Science Perio Support), dental chews (Virbac C.E.T. enzymatic chews), or prescription dental diets like Hill's t/d, which have texture that mechanically scrubs plaque. These are second-best to brushing but meaningful for cats that won't cooperate.

Feline Resorptive Lesions: The Painful Condition Most Owners Miss

Resorptive lesions affect up to 75% of cats over age 5. The body's own cells destroy the tooth structure from within, exposing sensitive dentin and pulp. The lesion looks like a small pink indentation near the gumline, often covered by inflamed gum tissue. These lesions cause significant pain -- cats with them often react visibly to being touched near the affected teeth.

Treatment is extraction. There's no way to reverse resorption or fill the lesion permanently. The extracted tooth site heals within 2-3 weeks, and most cats show noticeably improved behavior and appetite once the painful tooth is gone. Regular dental X-rays during professional cleanings catch these early, before they become severe.