October 2026
Guinea pigs greet the sound of the fridge door with a chorus of wheeks, and food is a big part of their happiness. It's also a big part of their health. Two topics come up with guinea pigs again and again: their teeth and their vitamin C. The two are connected, and both depend heavily on diet. That's good news, because diet is something you control.
All of a guinea pig's teeth, front and back, grow throughout life. They stay the right length only because constant chewing, especially on hay, wears them down. When that balance is off, the teeth can overgrow, form sharp points or become misaligned.
The back teeth, or cheek teeth, are the usual trouble spot. Overgrown cheek teeth can trap the tongue, cut the cheeks and make chewing painful. Because they sit far back in a small mouth, problems are hard to see without special instruments and imaging. Dental disease is one of the most common problems I see in pet guinea pigs, and it's a frequent cause of long-term, hidden pain.
Drooling or a wet chin is a classic sign. Your guinea pig may eat less, choose only soft foods, drop food or chew oddly. Weight loss sometimes shows up before you notice any change in eating, which is why weighing your pig regularly on a kitchen scale is one of the best early-warning tools you have. Other clues include overgrown or crooked front teeth, swelling on the jaw or face, watery eyes, fewer droppings, and a pig who chatters and explores less.
The most common causes are not enough hay, genetics and jaw shape, injury, and vitamin C deficiency, which weakens the tissues that hold teeth in place.
Like people, guinea pigs can't make their own vitamin C, so they need a reliable source every day. Vitamin C builds collagen, the protein that supports skin, gums, joints, blood vessels and the ligaments around the teeth. It also supports the immune system and wound healing.
Vitamin C deficiency is not a subtle imbalance. It's a predictable outcome of a diet that's missing something guinea pigs require, and without it, disease can develop quickly. That disease is scurvy. It can show up as swollen or bleeding gums, loose teeth, limping or swollen joints, a rough coat, slow wound healing, low energy and a poor appetite.
Fresh vegetables every day are the foundation. Bell peppers (red ones are a favorite), leafy greens and herbs such as cilantro and parsley are good choices. Add a quality guinea pig pellet fortified with vitamin C, and pay attention to freshness, because vitamin C breaks down over time with light and air. Store pellets properly and use them before they get old.
Some guinea pigs benefit from a supplement, but ask before adding drops to the water bottle. They can degrade quickly, and some pigs drink less when the water tastes different. Keep fruit to an occasional treat because of the sugar.
Water matters as well. Good water intake supports the gut and the bladder, and bladder stones are another common problem in guinea pigs. Guinea pigs tend to drink more from a bottle than a bowl, so keep fresh water available and check that bottles aren't clogged.
I'll examine the mouth and may recommend sedation or anesthesia for a full look at the cheek teeth, along with dental X-rays or CT. Treatment may include trimming and reshaping overgrown teeth, treating infection, extracting diseased teeth, pain relief and nutritional support. Many guinea pigs need repeat dental care over their lifetime, so dental disease is often managed rather than cured. The goal is a guinea pig who eats, grooms and explores comfortably.
Call the same day if your guinea pig hasn't eaten at all, has stopped producing droppings, or seems painful.
Book a prompt visit for drooling or a wet chin, eating less or weight loss, swelling on the face or jaw, limping, or bleeding gums.
Dr. Logan Kopp, Nashville's guinea pig specialist and a board-certified Diplomate in Exotic Companion Mammal Practice, diagnoses and treats dental disease and nutritional problems in guinea pigs at Priest Lake Veterinary Hospital. Call (615) 361-4646 to schedule.
This article is general information, not medical advice for your pet. Reading it doesn't create a veterinarian-client-patient relationship (VCPR). Please talk with your own veterinarian before making changes to your pet's care.