Cat Teeth Grinding: 6 Causes and When to Call a Vet

Cat teeth grinding, called bruxism, is most often a sign of mouth pain, nausea, or stress rather than a harmless habit. It matters for any owner who hears a crunching or clicking sound from their cat’s jaw, especially when it happens daily or alongside drooling or reduced eating.

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Cat teeth grinding at a glance:

• Short Answer: Grinding usually points to dental pain, digestive discomfort, or anxiety.
• Most Common Causes: Periodontal disease, tooth resorption, dental abscess, nausea, and stress.
• Urgency: Book a vet visit within a few days if grinding repeats; seek same-day care if your cat stops eating.
• What to Do at Home: Check for bad breath, drooling, and red gums, and keep the environment calm.
• When to See a Vet: Any grinding paired with appetite loss, weight loss, or facial swelling.

Why Cats Grind Their Teeth

Cats grind their teeth mainly to cope with pain or discomfort in the mouth, stomach, or nervous system. Grinding is not normal chewing, and healthy cats rarely do it.

When my cat first started making a faint scraping sound while resting, I assumed it was a quirk. A vet exam showed inflamed gums, which taught me how easily mouth pain hides behind small noises.

Cats instinctively mask pain, so a subtle sound may be the only early signal. The two broad categories are:

• Physical causes: dental disease, nausea, or jaw problems.
• Emotional causes: anxiety from changes in routine or surroundings.

Dental Problems Behind Cat Teeth Grinding

Dental disease is the leading physical cause of cat teeth grinding, and most adult cats over age 3 show some degree of it. Each condition below can make the mouth sore enough to trigger grinding.

Periodontal Disease

Periodontal disease is infection and inflammation of the gums caused by plaque and tartar buildup. Untreated, it leads to painful gums, loose teeth, and tooth loss, and regular brushing with a soft-bristled brush slows plaque buildup.

Tooth Resorption

Tooth resorption is a painful process where the body gradually breaks down a tooth from the inside. It is common in adult cats, often invisible without dental X-rays, and cats may grind or chatter their jaws when eating.

Dental Abscess

A dental abscess is a pocket of infected pus at a tooth root. It causes sharp pain, facial swelling, and fever, and it needs veterinary treatment rather than home care.

Oral Growths

Oral tumors and growths are less common but can cause pain, drooling, and blood-tinged saliva. Early exams catch these changes sooner, so keep up with regular veterinary check-ups.

Other Reasons Cats Grind Their Teeth

Not every case starts in the mouth, since nausea and anxiety also cause cat teeth grinding. Consider these causes when the teeth look clean.

• Nausea or stomach upset: Cats with acid reflux or inflammatory bowel disease may grind to cope with queasiness. Watch for lip licking, drooling, and episodes like vomiting and diarrhea.
• Stress and anxiety: A new pet, a move, or a changed schedule can trigger grinding. Cats that are suddenly withdrawn may also be hiding more than usual.
• Nutritional problems: An unbalanced diet can weaken gums and teeth over time. A complete, balanced cat food supports oral health.
• Jaw or bite problems: Misaligned teeth or a jaw injury can cause grinding when the cat chews or rests.

For general background on feline illness, the Cornell Feline Health Center offers reliable veterinary guidance.

Signs to Watch For and When to See a Vet

Occasional, brief grinding may be harmless, but frequent grinding with other symptoms needs a veterinarian. A vet should examine any cat that grinds repeatedly over several days.

Signs that make grinding more concerning:

• Drooling, especially with blood in the saliva.
• Bad breath, red gums, or visible tartar.
• Dropping food, chewing on one side, or eating less.
• Pawing at the mouth or pulling away when the face is touched.
• Weight loss, vomiting, or diarrhea.
• Reduced grooming or sudden irritability.

Cats with these signs are often in real pain, and knowing how a cat shows pain helps you act sooner. Go to an emergency vet if your cat refuses food for more than 24 hours, has facial swelling, or cannot close its mouth. Only a veterinarian can diagnose the cause, and you should never give human pain medication to a cat.

Treatment and Prevention at Home

Treatment depends on the cause, and most dental-related grinding improves after a professional cleaning or extraction. Your vet may recommend dental X-rays, antibiotics, or anti-nausea care.

Steps to protect your cat’s teeth:

1. Start slowly by letting your cat lick a veterinarian-approved toothpaste made for cats; never use human toothpaste.
2. Brush a few teeth at a time, working up to the whole mouth, using the gentle steps in this guide to brushing your cat’s teeth.
3. Aim for brushing most days, since plaque hardens into tartar in about 24 to 48 hours.
4. Offer dental treats or dental-formula food approved by your vet.
5. Schedule a dental exam at least once a year.

Reduce stress by keeping feeding times steady, giving quiet hiding spots, and adding daily play. Ideas for keeping an indoor cat entertained can help calm anxious cats. The VCA Animal Hospitals library explains common dental procedures if your vet recommends one.

Frequently Asked Questions

Cat teeth grinding is a signal worth taking seriously, because pain in the mouth or stomach is the most common cause. Check your cat’s gums this week, start gentle brushing, and book a vet exam if the grinding continues.