# Why Is My Chinchilla Grinding Its Teeth? Bruxism Causes Chinchillas grind and chatter their teeth for several reasons, and most of the time it is normal. But when the grinding is loud, constant, or paired with drooling, weight loss, or a poor appetite, it can signal dental pain. If you are asking why is my chinchilla grinding his teeth, the answer depends on when it happens and what else you see. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Light, rhythmic grinding or soft chattering during rest, eating, or when your chinchilla is content is usually normal. - Loud, harsh grinding that happens often, especially with drooling, watery eyes, or dropped food, points to dental disease. - Chinchilla teeth grow continuously, so overgrowth, sharp points, and root elongation are common problems. - Dental disease in chinchillas is often advanced before owners notice obvious signs, so early veterinary evaluation matters. - Never try to trim or file your chinchilla's teeth at home. Only a veterinarian should do that. ## What Tooth Grinding Looks Like and What Is Normal Chinchillas make a range of mouth noises. Soft, rhythmic grinding while resting is often a sign of comfort. Some chinchillas chatter their teeth lightly when they are annoyed or warning another chinchilla to back off. You may also hear quiet grinding as they chew hay or pellets. Normal grinding tends to be: - Soft and rhythmic - Brief - Linked to eating, resting, or mild irritation - Not accompanied by drooling, weight loss, or eye changes Abnormal grinding, called bruxism, is different. It is often louder, more repetitive, and happens when your chinchilla is not eating. Some chinchillas grind hard enough that you can hear it across the room. Others grind while pressing their face against a cage bar or a hide box. Because chinchillas hide pain well, the behavior alone is not enough to judge. You need to look at the whole picture: appetite, droppings, weight, eye and nose discharge, and how your chinchilla chews. ## Why Is My Chinchilla Grinding His Teeth? Main Causes Several problems can cause bruxism in chinchillas. Dental disease is the most common medical reason. Behavioral and stress-related causes also exist. A large study of chinchillas that had skull CT scans found that apical elongation of premolar or molar teeth was the most common finding, seen in 97 of the cases [1]. Apical elongation means the tooth root grows abnormally long and pushes into the surrounding bone. Premolar or molar tooth curvature was also common, seen in 92 chinchillas in the transverse plane and 77 in the sagittal plane [1]. Sharp dental points were found in 91 chinchillas [1]. These changes cause real pain when your chinchilla chews. Dental disease can also affect structures beyond the mouth. In two chinchillas with chronic dental disease, contrast CT imaging showed nasolacrimal duct obstruction related to their dental problems [2]. That is why chronic dental disease can cause eye discharge or watery eyes. | Cause | Typical clues | How urgent | |---|---|---| | Normal contentment grinding | Soft, brief, happens at rest or while eating | Not urgent | | Dental pain from overgrowth, sharp points, or root elongation | Loud grinding, drooling, dropping food, weight loss, watery eyes | See a vet soon, same day if not eating | | Dental abscess or infection | Facial swelling, eye discharge, foul breath, pain when touched | Urgent, same day | | Gastrointestinal stasis or gut slowdown | Small or missing droppings, not eating, hunched posture | Emergency | | Stress, boredom, or poor housing | Grinding with cage biting, fur chewing, pacing | Routine visit, address husbandry | | Pain elsewhere in the body | Grinding with limping, straining, or reluctance to move | See a vet soon | ### Dental Disease Chinchilla teeth grow throughout life. In the wild, abrasive food wears them down. In captivity, a diet low in hay or high in soft foods can let teeth overgrow. Overgrown cheek teeth develop sharp points that cut the tongue and cheeks. Roots can elongate into the jaw or even toward the eye [1]. Signs of dental disease include: - Drooling or a wet chin - Dropping food while eating - Eating only soft items and leaving hay - Weight loss - Watery or crusty eyes - Grinding that gets louder or more frequent - Swelling on the face or jaw If you see any of these, your chinchilla needs a veterinary exam. Dental disease in chinchillas is often progressive, and waiting can make treatment harder. You can read more about diagnosis and treatment in [Chinchilla Dental Disease: Diagnosis and Treatment](/knowledge/veterinary-medicine/small-mammal-care/chinchilla-dental-disease-diagnosis-treatment). ### Gastrointestinal Stasis Chinchillas that stop eating because of dental pain can develop gastrointestinal stasis. The gut slows down, droppings get smaller or stop, and the chinchilla becomes very sick. Grinding paired with no droppings or a hunched posture is an emergency. Learn the signs in [Chinchilla Gastrointestinal Stasis: Causes, Signs, and Management](/knowledge/veterinary-medicine/small-mammal-care/chinchilla-gastrointestinal-stasis-causes-signs-management). ### Stress and Poor Husbandry Not all grinding is dental. A survey of 336 pet chinchilla caretakers found that 14.3% kept their chinchillas individually, and 27.6% of Austrian respondents reported undersized cages or enclosures [3]. The same survey found that 14.7% of chinchillas were suffering from a disease [3]. Repetitive behaviors like fur biting were less common, occurring never in 82.9% of chinchillas [3]. Stress-related grinding often comes with other signs: - Cage biting or bar chewing - Pacing - Fur chewing or fur biting - Hiding more than usual - Reduced interest in dust baths Fur chewing is a behavioral disorder that can indicate a past or present welfare problem, and it has a genetic component in chinchillas [4]. If your chinchilla grinds and also chews fur, talk to your veterinarian about housing, enrichment, and social needs. ### Pain From Other Sources Chinchillas may grind their teeth when they hurt anywhere, not only in the mouth. Bladder stones, injuries, and gut pain can all cause bruxism. A full physical exam helps sort this out. ## Red Flags That Make It an Emergency Some signs mean you should stop reading and call a veterinarian now. - Not eating at all for more than a few hours - No droppings, or very small droppings - Labored breathing or open-mouth breathing - Facial swelling that appeared quickly - Collapse, weakness, or unresponsiveness - Seizures or tremors - Bleeding from the mouth - Eye bulging or severe eye discharge Chinchillas are small and can decline fast. A chinchilla that is not eating is at risk of gut stasis and other serious problems. Do not wait until morning if these signs appear at night. ## Safe Things You Can Do at Home While Waiting You cannot fix dental disease at home, but you can keep your chinchilla comfortable and gather useful information for your vet. - Weigh your chinchilla on a kitchen scale. Write down the number and the date. - Offer fresh hay and water. Note whether your chinchilla eats, and how much. - Count droppings over a few hours. Note size, number, and shape. - Check the chin and chest for wet fur from drooling. - Look at the eyes for discharge or crusting. - Keep the room quiet and warm, away from drafts and loud pets. - Do not try to open the mouth, trim teeth, or give human pain medicine. Never give your chinchilla over-the-counter pain relievers. Many are toxic to small mammals. Your veterinarian will calculate any medication dose from your chinchilla's weight and health. If your chinchilla stops eating, call your vet right away. If you suspect poisoning from a plant or household product, call the ASPCA Animal Poison Control Center at (888) 426-4435 or the Pet Poison Helpline at (855) 764-7661. ## What Your Veterinarian Will Check and Test Your veterinarian will start with a full history. They will ask about diet, hay intake, droppings, weight changes, and when the grinding started. Then they will do a physical exam. Key exam steps include: - Checking body weight and body condition - Looking at the incisors and, when possible, the cheek teeth - Feeling the jaw and face for swelling or asymmetry - Checking the eyes for discharge or bulging - Listening to the chest and belly - Checking the droppings and belly for signs of gut stasis Many chinchillas need imaging to see the tooth roots and cheek teeth. Skull CT is the best way to evaluate dental disease in this species. In one large case series, both fan-beam and cone-beam CT studies were used, and contrast was given in 12 fan-beam cases [1]. CT can show apical elongation, tooth curvature, sharp points, and resorptive lesions that cannot be seen on a plain exam [1]. Your veterinarian may also recommend: - Skull radiographs if CT is not available - Blood work to check organ function before anesthesia - Contrast CT dacryocystorhinography if eye discharge suggests nasolacrimal duct problems [2] - A thorough oral exam under anesthesia Treatment depends on the findings. Sharp points may be filed under anesthesia. Overgrown teeth may need trimming. Abscesses may need drainage, antibiotics, or surgery. Some chinchillas need repeated dental care for life. You can read more in [Chinchilla Care: Overgrown Dental Spurs & Tooth Trimming Guide](/knowledge/veterinary-medicine/exotic-small-animals/chinchilla-care-overgrown-dental-spurs-tooth-trimming-guide). ## Prevention and Monitoring You cannot prevent every dental problem, but good husbandry lowers the risk. Feed a diet built on grass hay. Hay wears teeth down and supports gut health. Pellets should be plain and measured, not a free buffet of treats. Limit sugary treats and soft foods. Offer safe chew items. Apple wood, willow, and untreated cardboard can help. Avoid plastics and anything your chinchilla can swallow. Keep housing large and enriching. The survey data showed that undersized enclosures and individual housing are common welfare issues [3]. A bigger cage, a companion when appropriate, and daily out-of-cage time can reduce stress behaviors. Weigh your chinchilla weekly. A drop of even a few ounces matters in a small pet. Track it so you notice trends. Check the chin and eyes daily. A wet chin or watery eye is an early clue. Schedule routine veterinary visits. Ask your vet how often your chinchilla should be seen. Many exotic vets recommend a checkup at least once a year, and more often for chinchillas with known dental disease. If your chinchilla grinds and also shows gut signs, read [Chinchilla Gastrointestinal Stasis: Causes, Signs, and Management](/knowledge/veterinary-medicine/small-mammal-care/chinchilla-gastrointestinal-stasis-causes-signs-management). If you have a dog that grinds, the causes are different, and you can compare notes in [Why Is My Dog grinding teeth? Bruxism Dental Pain and GI Nausea](/knowledge/veterinary-medicine/symptom-guides/why-is-my-dog-grinding-teeth-bruxism-dental-pain-and-gi-nausea). ## Limitations and When to Contact a Veterinarian This article cannot tell you what is happening in your chinchilla's mouth. Only a veterinarian who examines your pet can do that. Individual cases need a veterinarian. Contact your veterinarian the same day if your chinchilla: - Grinds loudly and often - Drools or has a wet chin - Drops food or refuses hay - Has watery or crusty eyes - Loses weight - Has facial swelling - Shows a change in droppings Go to an emergency clinic now if your chinchilla: - Is not eating at all - Has no droppings or very few - Breathes with an open mouth or struggles to breathe - Collapses or seems unresponsive - Has severe bleeding or a sudden large swelling For routine care, ask your vet about a dental check at your next visit. Early detection makes treatment easier and keeps your chinchilla more comfortable. ## Frequently Asked Questions ### Is it normal for chinchillas to grind their teeth? Yes, soft and brief grinding can be normal. Chinchillas grind when relaxed, when eating, and when mildly annoyed. The problem is loud, frequent grinding that comes with other signs like drooling or weight loss. ### How can I tell if my chinchilla's teeth are hurting? Look for changes in eating and behavior. A chinchilla in dental pain often drops food, avoids hay, drools, or has watery eyes. Weight loss and loud grinding are also common clues. ### Do chinchillas grind their teeth when they are happy? Some do. A soft, rhythmic grind during rest or while being petted can mean your chinchilla is content. Watch the rest of the body: relaxed posture and normal eating suggest comfort. ### Can I file my chinchilla's teeth at home? No. Home filing is dangerous and can cause serious injury. Chinchilla teeth are delicate, and the mouth is small. Only a veterinarian should examine, trim, or file teeth, usually under anesthesia. ### When should I call the vet about tooth grinding? Call the same day if the grinding is new, loud, or paired with drooling, eye changes, or weight loss. Call immediately if your chinchilla stops eating or stops producing droppings. ## Related Articles - [Chinchilla Care: Overgrown Dental Spurs & Tooth Trimming Guide](/knowledge/veterinary-medicine/exotic-small-animals/chinchilla-care-overgrown-dental-spurs-tooth-trimming-guide) - [Chinchilla Gastrointestinal Stasis: Causes, Signs, and Management](/knowledge/veterinary-medicine/small-mammal-care/chinchilla-gastrointestinal-stasis-causes-signs-management) - [Chinchilla Dental Disease: Diagnosis and Treatment](/knowledge/veterinary-medicine/small-mammal-care/chinchilla-dental-disease-diagnosis-treatment) - [Why Is My Chinchilla Drooling? Causes and When to Worry](/knowledge/veterinary-medicine/small-mammal-care/chinchilla-drooling-causes) - [Why Is My Chinchilla Not Eating? Causes and What to Do](/knowledge/veterinary-medicine/small-mammal-care/chinchilla-not-eating) ## References 1. [Computed tomography findings and severity grading of acquired dental disease in chinchillas (Chinchilla lanigera): 100 cases (2007-2023)](https://pubmed.ncbi.nlm.nih.gov/41849811/). Journal of the American Veterinary Medical Association, 2026. 2. [Contrast computed tomography dacryocystorhinography identifies nasolacrimal duct obstruction secondary to chronic dental disease in two chinchilla langeria](https://pubmed.ncbi.nlm.nih.gov/39331564/). Veterinary ophthalmology, 2025. 3. [Husbandry Conditions and Welfare State of Pet Chinchillas (Chinchilla lanigera) and Caretakers' Perceptions of Stress and Emotional Closeness to Their Animals](https://pubmed.ncbi.nlm.nih.gov/39518878/). Animals : an open access journal from MDPI, 2024. 4. [Determination of the Genetic Component of Fur-Chewing in Chinchillas (Chinchilla lanigera) and Its Economic Impact](https://pubmed.ncbi.nlm.nih.gov/30134521/). Animals : an open access journal from MDPI, 2018. ## Further Reading - [Merck Veterinary Manual: Chinchillas](https://www.merckvetmanual.com/all-other-pets/chinchillas)