Dental Disease (Malocclusion) in Guinea Pigs
- Feb 6
- 3 min read
Why teeth matter more than you think
Guinea pigs are natural grazers, designed to chew constantly. Their teeth grow continuously throughout their lives, which means they rely on a fibre‑rich diet — especially hay — to keep everything worn down and aligned. When this balance is disrupted, dental disease can develop, and one of the most common forms is malocclusion.
Malocclusion occurs when the teeth become misaligned or overgrown, making it difficult or painful for a guinea pig to eat. Because guinea pigs hide discomfort instinctively, dental issues can progress quickly if not spotted early.
What Is Malocclusion?
Guinea pigs have 20 teeth, including incisors at the front and molars at the back. All of them grow continuously. When a pig isn’t wearing their teeth down properly, the teeth can:
• Overgrow
• Develop sharp edges or “spurs”
• Tilt or curve abnormally
• Trap the tongue or cheeks
This misalignment is known as malocclusion, and it can severely affect eating, grooming, and overall comfort.
Symptoms of Dental Disease
Dental problems often start subtly. Look out for:
Drooling (“Slobbers”)
Wet fur under the chin or chest is a classic sign of dental discomfort.
Weight Loss
If chewing hurts, pigs eat less — and weight drops quickly. Weekly weighing is essential.
Reduced Appetite
They may approach food eagerly but struggle to chew or swallow.
Sharp Tooth Edges
These can only be seen by a vet but can cause mouth sores and tongue entrapment.
Behavioural Changes
• Dropping food
• Picking at food
• Preferring soft foods
• Sitting hunched or looking uncomfortable
Any of these signs should prompt a dental check.
Common Causes of Malocclusion
Lack of Fibrous Hay
Hay is essential for natural tooth wear. Without unlimited, good‑quality hay, overgrowth is almost guaranteed.
Genetics
Some guinea pigs are simply more prone to dental issues due to inherited jaw shapes or tooth structure.
Low Vitamin C
Vitamin C deficiency affects gum health and chewing efficiency, increasing the risk of misalignment.
Injury or Illness
Jaw trauma, abscesses, or chronic illness can alter chewing patterns and lead to dental problems.
How Vets Diagnose Dental Disease
Because guinea pig mouths are small and molars sit far back, proper diagnosis often requires:
• A specialised otoscope
• Gentle sedation for a full view
• X‑rays to assess roots and jaw alignment
Front teeth alone rarely tell the full story — a full dental exam is essential.
Treatment Options
Treatment depends on severity but may include:
• Trimming or filing overgrown teeth under anaesthetic
• Correcting sharp edges to prevent tongue or cheek injury
• Pain relief to support comfortable eating
• Support feeding with recovery food
• Addressing underlying causes, such as diet or vitamin C intake
Some pigs with genetic or chronic issues may need regular dental work throughout their lives.
Prevention at Home
Provide Unlimited Hay
Hay should make up 80–90% of their diet. Long‑strand, coarse hay is best for tooth wear.
Offer Safe Chew Options
• Hay
• Forage
• Willow sticks
• Safe wooden toys
Avoid hard “dental treats” — they can cause more harm than good.
Ensure Adequate Vitamin C
Daily fresh veg and a balanced pellet help maintain oral health.
Weigh Weekly
A small drop in weight is often the first sign of dental trouble.
Observe Eating Habits
Any change in chewing, food preference, or behaviour around mealtimes is worth investigating.
When to See a Vet
If you notice drooling, weight loss, or difficulty eating, seek veterinary care promptly. Dental disease rarely resolves on its own, and early intervention makes a huge difference.
Final Thoughts
Dental health is one of the most important — and often overlooked — parts of guinea pig care. With the right diet, regular checks, and quick action when something seems off, you can help your pig live a long, comfortable, hay‑filled life.
Your guinea pig relies on you to notice the small changes. Trust your instincts — they’re usually right.
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