A dog's tooth that turns pink, purple, gray or dull is usually dead or dying on the inside. In two veterinary studies, roughly 9 out of 10 discolored teeth had a dead pulp. The tooth may not seem to bother your dog today, but it still needs a vet visit with dental X-rays, and the usual fixes are a root canal or an extraction.
The rest of this page covers what each color means, why dogs rarely show the pain, what X-rays can and can't show, how the two treatments compare, and which chews break the most teeth.
What a dead tooth is
Every tooth has a living core called the pulp: nerves and blood vessels in a channel that runs from the crown down to the tip of the root. Around it sits dentin, and over the crown, a thin shell of enamel. A tooth is "vital" while the pulp is alive and "non-vital" (dead) once the pulp has died. Vets call disease of the pulp endodontic disease.
The pulp dies in a few ways:
- A knock without a break. A blow to the tooth, from catching a rock, a collision during play or a hard chew, can bruise the pulp. The pulp has only one blood supply, entering through the tip of the root, so it heals poorly. Blood leaks into the tiny tubes of the dentin and stays trapped there, which is what stains the tooth (Merck Veterinary Manual).
- A break that opens the pulp. Once a fracture exposes the pulp, bacteria get in and the tooth will die without treatment.
- Gum disease from below. Severe periodontitis can track down the root to its tip and infect the pulp from the bottom up.
- Wear or decay. Teeth worn down by chewing, and the occasional deep cavity, can reach the pulp too.
In dogs, most pulp injuries are diagnosed when they are already irreversible. That matters for everything that follows: a discolored tooth is not a stain to watch, it is a tooth that has usually already lost its living center.
What the color tells you
Color is a clue, not a diagnosis. Your vet confirms it with an exam and X-rays, but this is what each look usually points to.
What you see | What it usually means | What to do |
|---|---|---|
The whole crown turns pink, purple, gray, reddish-brown, green or dull, and the tooth is not broken | Bleeding inside the tooth after a knock. The pulp is usually dead or dying | See your vet soon for an exam and dental X-rays |
Yellow or brown crust, thickest near the gum line | Tartar: plaque that has hardened with minerals from saliva | Mention it at your next visit; sooner if there is bad breath or red, bleeding gums |
A smooth, flattened tip with a tan to brown center | Wear. If it happens slowly, the tooth can seal itself with new dentin and stay alive, but some worn teeth are dead inside | Ask for an X-ray of that tooth; see your vet soon if the center looks dark |
A dark brown or black dot or hole in a broken or worn tooth | The pulp canal is open and the pulp has died; the tooth is infected | See your vet soon |
A red or pink dot in a freshly broken tooth | The pulp is exposed and still alive | Call your vet the same day |
Merck lists pink, purple, gray and green, or simply a dull look, as the usual colors of a tooth whose pulp has bled. A tooth that turned pink right after a knock still needs a vet visit soon. Merck notes that a mildly injured pulp can heal, and board-certified veterinary dentist Dr. Patrick Vall writes that a discolored tooth caught early enough can sometimes be saved with vital pulp therapy. Tooth wear and tartar are also what vets read when they estimate an adult dog's age, so an older dog with flat, tan tips is common. A single tooth that looks different from its neighbors is the one to get checked.
How many discolored teeth are really dead?
Most of them. Two studies looked inside discolored dog teeth:
- Feigin and colleagues, 2022 (Journal of Veterinary Dentistry) followed 102 discolored teeth in 69 dogs aged 1 to 15. Under the microscope, 85 of the 97 teeth examined (87.6%) were dead. Only 12 (12.4%) still had an inflamed but living pulp. More than half of the discolored teeth (53.9%) showed no visible damage to the crown at all.
- Hale, 2001 (Journal of Veterinary Dentistry) reviewed 84 discolored teeth in 71 dogs, shaded pink, purple, gray or tan. In the 64 teeth where the pulp could be inspected during treatment, 59 (92.2%) showed partial or complete pulp death.
That is why Merck states that 87% to 92% of discolored teeth are non-vital, and why the 2001 study recommended a root canal or extraction for discolored teeth. The "no visible damage" figure is worth sitting with too: you may never know what your dog bit or bumped.
Does a dead tooth hurt?
It can, on and off, and your dog will rarely tell you. Merck describes three phases:
- While the pulp is dying, the tooth is thought to be painful. This can take weeks, months or longer.
- Once the nerve is dead, the tooth may go quiet and stop hurting, sometimes for months to years.
- When infection sets in at the root, the tooth becomes painful again, and an abscess can form.
Merck notes that most dogs mask their pain, and Dr. Vall points out that dogs in oral pain most often keep eating, so "he's still eating" doesn't rule out a sore tooth. Signs that do show up include:
- Chewing on one side, or dropping food
- Preferring soft food, or turning down hard treats and chew toys
- Not wanting to pick up or hold toys, or less interest in play
- Drooling, lip licking, or pawing at the face or mouth
- Pulling away when the tooth or that side of the face is touched
- A swelling on the face: below the eye with an upper cheek tooth, or along the side of the nose with an upper canine
- A pimple-like red bump on the gum near the tooth, which can drain pus (a draining tract)
- Eating less
Many dogs with damaged teeth show none of these, which is exactly why the color change itself is reason enough to book a visit.
Why your vet needs dental X-rays
The crown is only part of the tooth. The root, the pulp canal and the bone around them sit under the gum, and dental X-rays are the only way to see them. In dogs they are taken under general anesthesia, together with a full exam and probing of every tooth, which gives the vet the best possible look at the mouth (Merck Veterinary Manual). If you want to know what the X-ray side of a vet visit involves, see our guide to what to expect with dog X-rays.
On the films, a vet looks for:
- A wider canal than the tooth next to it. A living pulp keeps laying down dentin from the inside, so the canal narrows with age. A dead pulp stops, so its canal stays wider than its living neighbor's.
- A dark halo around the root tip, which means infection has spread into the bone.
- Cracks in the root and other damage you can't see from outside.
A discolored tooth can look normal on an X-ray and still be dead. In the 2022 study, 19 of the 102 stained teeth (18.6%) were radiographically normal; in the 2001 study, 42.9% showed no X-ray signs of pulp disease. A brand-new abscess may not show on X-ray either (Merck Veterinary Manual).
So a normal X-ray doesn't rule out a dead tooth. Your vet reads the color, the exam and the X-rays together. Depending on what they find, they may recommend treating the tooth anyway, as the 2001 study did for discolored teeth, or recheck it with more imaging. Board-certified veterinary dentist Dr. Katie Kling notes that some root damage only shows up on a cone beam CT scan (CBCT), not on dental X-rays alone.
Treatment: root canal or extraction
A dead tooth doesn't come back to life, and leaving it in place risks an infection at the root that can turn into an abscess. Merck lists two standard treatments for a tooth that is suspected to be dead:
Root canal | Extraction | |
|---|---|---|
What happens | The dead pulp is removed, the canal is disinfected, filled and sealed, and the opening is closed with a filling | The tooth is surgically removed. Large teeth usually need a small gum flap and some bone removed, then the site is stitched closed |
Keeps the tooth | Yes, with its shape and function | No |
Who does it | Often a board-certified veterinary dentist, by referral | Your vet, or a specialist for difficult teeth |
Afterward | Follow-up X-rays to check it has healed; a root canal can fail | Healing of the gum and socket |
Often chosen for | Canines and the big chewing teeth (carnassials) | Other teeth, dogs under about 11 months, or when a root canal isn't practical |
Merck calls the canines and the carnassials (the upper fourth premolar and lower first molar) "strategic" teeth, the ones that do most of the gripping and chewing, and root canal is more often recommended for them. The trade-offs it lists for a root canal are cost, the specialist skill it needs, the chance of failure and more follow-up. Working dogs, such as police and military dogs, often have root canals, sometimes with a crown to protect what is left of the tooth. The American Veterinary Dental College lists root canal therapy among the common reasons for referral to a board-certified veterinary dentist, so ask your vet whether it is an option.
If extraction is the better choice, take heart: Merck notes that dogs do surprisingly well without the teeth they lose.
Two timing details matter:
- A fresh break with a pink or red spot: call your vet the same day. A procedure called vital pulp therapy can sometimes keep the tooth alive, and Merck says it works best within 24 to 48 hours of the injury.
- Young dogs (under about 11 months) whose adult tooth breaks into the pulp are not candidates for a standard root canal, because the root hasn't finished forming. Extraction or vital pulp therapy are the options, depending on how quickly they're seen.
Your vet chooses any pain relief or antibiotics around the procedure. Please don't give human painkillers at home.
Broken teeth: the other way teeth die
Tooth trauma affects as many as 26.2% of dogs and cats, and a fracture is the most common kind (Today's Veterinary Practice). The canines (the fangs) and the big upper cheek tooth, the carnassial, are the ones that usually take the hit. Board-certified veterinary dentist Dr. Katie Kling writes that, in her experience, dogs most often crack the carnassial on hard nylon bones, marrow bones, antlers, and non-toy objects such as ceramic, cage bars and rocks.
Any broken tooth should be checked by your vet to see whether the pulp is involved. If the break has opened the pulp, the tooth will die, and it needs a root canal or an extraction. Kling puts it plainly: with an exposed pulp there is nothing to "wait and see." A break that stops short of the pulp still needs that check, because only the exam and X-rays show whether the pulp has been damaged. In a study Kling cites, about 24% of fractured teeth without an exposed pulp still needed treatment. That goes for dogs that seem fine, too: many dogs with fractured teeth show no signs at all.
How to protect your dog's teeth
You can't prevent every bump, but you can take the hardest objects out of the mouth. Merck's list of things that break dogs' teeth:
- Real bones, cooked or raw, "regardless of the state of processing"
- Antlers and hooves
- Hard nylon toys
- Rocks
- Chewing on fences and cage bars
Dr. Vall adds two more. Tennis balls chewed throughout the day can act almost like sandpaper on the teeth, especially once dirt and grit collect in the fuzz. And for any chew, he suggests a simple test: skip anything you can't easily bend or break, anything you wouldn't want thrown at your knee, and anything you could pound a nail with.
Chewing itself isn't the problem, and Kling notes that the right toys still have benefits. Swap the risky items rather than banning chews:
- Choose products with the Veterinary Oral Health Council (VOHC) Seal, which marks treats, chews and diets shown to help control plaque or tartar.
- Brush with a toothpaste made for dogs. Daily is best; human toothpaste is not for dogs. Brushing prevents gum disease (Merck puts it simply: gum disease will not develop around clean teeth), and Merck estimates that up to 80% of dogs have some gum disease by age 2. It won't stop a tooth from cracking on an antler, though.
- Lift the lip and look. A quick weekly look lets you spot a tooth that has changed color or chipped.
- Keep regular dental checkups with your vet, and ask for dental X-rays when your dog has a cleaning under anesthesia.
A loose adult tooth also needs a vet visit. Gum disease that destroys a tooth's support is the main reason dogs lose teeth.
When to call your vet
Call now (same day):
- A freshly broken tooth with a pink or red spot in the middle
- Swelling of the face, below the eye or along the nose
- Your dog won't eat, or is in obvious pain
See your vet soon (within days):
- A tooth that has turned pink, purple, gray or dull, including one that changed color right after a knock
- A broken or chipped tooth, even if your dog seems fine
- A dark dot or hole in a worn or broken tooth
- A loose adult tooth
- Chewing on one side, dropping food, pawing at the mouth, or a bump on the gum
Mention at your next visit:
- Tan, smooth wear on several teeth in an older dog
- Yellow-brown tartar with no bad breath or red gums
Quick answers
Can a dead tooth turn white again? Don't count on it. Blood trapped in the dentin isn't cleared away, and in dogs most pulp injuries are already irreversible when they're found. A minor injury can occasionally heal, which is one more reason to let your vet's exam and X-rays decide.
Can I leave a dead tooth if my dog seems fine? A dead tooth can be quiet for months or years and then become infected and painful. Based on how rarely discolored teeth turned out to be alive, the 2001 study recommended a root canal or extraction for them. Talk it through with your vet.
Is a dead tooth an emergency? Usually not a same-day one. Book a visit within days. A fresh break with a pink spot, facial swelling, or a dog that won't eat is a call-now situation.
Will my dog cope without the tooth? Dogs adapt well after extractions. Merck notes they do surprisingly well without the teeth they lose.
Sources
- Merck Veterinary Manual: Endodontic Disease in Small Animals
- Merck Veterinary Manual (pet owner version): Dental Disorders of Dogs
- Merck Veterinary Manual: Periodontal Disease in Small Animals
- Feigin K et al. Analysis and Assessment of Pulp Vitality of 102 Intrinsically Stained Teeth in Dogs. Journal of Veterinary Dentistry, 2022
- Hale FA. Localized Intrinsic Staining of Teeth Due to Pulpitis and Pulp Necrosis in Dogs. Journal of Veterinary Dentistry, 2001
- Today's Veterinary Practice: Fractured Teeth (Katie Kling, DVM, DAVDC), 2022
- American Veterinary Dental College: Animal Owner Resources
- Animal Dental Care & Oral Surgery (Patrick Vall, DVM, DAVDC): Why Are My Dog's Teeth Discolored?
- Veterinary Dental Services: Worn Pet Teeth
- Veterinary Oral Health Council
This article is for general information and is not a substitute for advice from your veterinarian.
