What Your Pet's Teeth and Breath Are Telling You
The most common dental problems in pets
Dogs and cats develop the same dental diseases humans do, and they happen for the same reasons: plaque builds up, hardens into tartar, and bacteria work their way under the gum line. The most frequent problem is periodontal disease, which affects the structures holding the tooth in place. It starts invisibly below the gum and can destroy bone before you see any sign.
After periodontal disease, the next most common issues are tooth fractures (especially in dogs who chew hard objects), tooth resorption in cats (where the tooth essentially dissolves from the inside), and retained baby teeth in young pets whose adult teeth came in but the baby teeth never fell out. Oral tumors and cysts are less common but serious when they occur.
Pets also get cavities, though far less often than humans do. Cats almost never get cavities. Dogs get them occasionally, usually on the back molars where food gets trapped.
Key Takeaways
- Bad breath in a pet is not normal and usually signals bacterial infection under the gum line, not just food debris.
- Visible tartar buildup, red or swollen gums, and loose teeth are signs that disease is already established and your pet needs a veterinary exam.
- Behavioral changes like dropping food, chewing on one side only, or pawing at the mouth often mean tooth pain, which pets hide until the problem is severe.
- Dental disease in pets can spread bacteria to the heart, kidneys, and liver if left untreated, making early detection important for overall health.
- Your veterinarian can see disease on X-rays that is invisible to the eye, so annual dental checks catch problems before they become painful or costly.
Warning signs you should not ignore
The earliest sign of dental disease is often a change in breath odor. A healthy pet's breath should be neutral or slightly meaty — not sweet, sour, or foul. Bad breath means bacteria are multiplying, usually under the gum line where you cannot see them.
Visible signs come later. Look for yellow or brown buildup on the teeth (tartar), red or swollen gums, or gums that bleed when your pet chews. Some pets develop a bump or swelling on the face or jaw, which can indicate an abscess or tumor. Loose or missing teeth are a sign that bone loss has already happened.
Behavioral changes are often the first thing owners notice, even though they mean the disease is advanced. A pet in dental pain may drop food from its mouth while eating, chew only on one side, paw at its face or mouth, or stop eating hard food altogether. Some pets become withdrawn or irritable. Drooling more than usual, especially if it is tinged with blood, is another red flag.
How tartar and plaque damage teeth and gums
Plaque is a sticky film of bacteria that forms on teeth within hours of eating. If it is not removed, it hardens into tartar (also called calculus) within days. Tartar is rough and porous, so it traps more bacteria underneath.
As bacteria multiply under the gum line, they release toxins that destroy the periodontal ligament — the tissue that anchors the tooth to the bone. The gum pulls away from the tooth, creating a pocket where more bacteria hide. Your pet's own immune system tries to fight back, but it also damages the bone and tissue in the process. Eventually the tooth becomes loose and falls out, or the infection spreads deeper into the jaw.
This process is usually painless until it is far advanced, which is why many pets show no signs until the damage is severe. By the time a pet stops eating or you notice swelling, the infection may have been building for months or years.
When dental disease affects the rest of the body
Bacteria from infected teeth and gums can enter the bloodstream and travel to the heart, kidneys, and liver. This is especially risky in older pets or those with existing heart or kidney disease. Studies in dogs show that untreated dental disease correlates with heart valve problems and kidney damage, though the exact mechanism is still being studied.
Severe infections can also cause an abscess — a pocket of pus that builds pressure under the tooth or in the jaw. An abscess can rupture through the skin, creating a draining hole on the face or under the jaw. This is painful and requires urgent treatment.
For these reasons, your veterinarian may recommend dental cleaning even if your pet seems fine, especially as your pet ages. Removing the source of infection protects not just the teeth but the whole body.
What happens during a veterinary dental exam
A dental exam starts with what your veterinarian can see and feel: tartar buildup, gum color and texture, loose teeth, and any lumps or swelling. But most dental disease happens below the gum line, so your veterinarian will recommend dental X-rays to see the bone and tooth roots.
X-rays show bone loss, tooth fractures that extend below the gum, resorption in cats, and abscesses. They also reveal retained baby teeth and impacted teeth. Without X-rays, your veterinarian is essentially guessing about what is happening under the surface.
If your veterinarian finds disease, they will discuss treatment options with you. For early periodontal disease, a professional cleaning under anesthesia may stop the progression. For advanced disease, some teeth may need to be removed. Your veterinarian will explain what they find and what your pet needs.
Differences between dog and cat dental problems
Dogs and cats get periodontal disease at similar rates, but the specific problems differ. Cats are prone to tooth resorption, a condition where the body breaks down the tooth structure itself. The cause is unknown, but it is painful and common — some estimates suggest it affects up to 75% of cats over age 5. Affected teeth usually need to be removed.
Cats also get stomatitis, an inflammation of the mouth and gums that can be severe and painful. Dogs rarely get stomatitis but are more likely to fracture teeth on hard chew toys or bones. Dogs also develop cavities occasionally, while cats almost never do.
Both species can get oral tumors, though they are less common. Older pets of both species are at higher risk, which is why dental exams become more important as your pet ages.
Frequently Asked Questions
Does my pet really need anesthesia for a dental cleaning?
Yes. Anesthesia allows your veterinarian to clean below the gum line, take X-rays, and remove diseased teeth safely. Awake cleanings only remove tartar from the visible crown of the tooth and miss the disease underneath, which is where the real problem is. Anesthesia also keeps your pet still so your veterinarian can work without causing injury.
Can I prevent dental disease by brushing my pet's teeth?
Brushing helps slow plaque buildup and is worth doing if your pet tolerates it, but it cannot prevent disease entirely. Daily brushing is most effective, but even a few times a week makes a difference. Dental diets and water additives have some benefit too, though they work best alongside brushing and regular veterinary cleanings.
What does it mean if my pet has a bump under the jaw?
A bump under the jaw can be a swollen lymph node, an abscess from a tooth infection, or rarely a tumor. Your veterinarian needs to examine it and may recommend X-rays or other imaging. Do not wait to have it checked — infections can spread quickly, and tumors are easier to treat when caught early.
Is it normal for my older pet to lose teeth?
Tooth loss is common in older pets, but it is not normal or inevitable. It means periodontal disease has progressed to the point where the tooth is no longer anchored. Regular dental exams and cleanings throughout your pet's life can prevent or delay tooth loss. If your older pet still has most of their teeth, that is a sign of good dental care over time.
Can a pet eat normally with missing teeth?
Most pets do fine with missing teeth, especially if the loss happened gradually and they adapted over time. Pets do not chew the way humans do — they mostly tear and swallow. Even a pet missing several teeth can eat regular kibble, though some owners switch to wet food or soften dry food if their pet seems to struggle.