Last updated October 12, 2026
A pink, purple or gray tooth in a dog usually means the pulp, the living tissue inside the tooth, has been bruised or has died. That's a vet visit, often within days. Brushing won't shift it. Brown or yellow crust near the gumline is usually tartar, which sits on the outside of a healthy tooth and comes off with a vet cleaning.
Caniclean, our seaweed powder, helps reduce plaque. It does nothing for a pink, purple or gray tooth, and it can't lift tartar that has already hardened.
A pink, purple or gray tooth is one of several dental problems that only a vet can treat. Our overview of common dental problems in dogs shows which ones home care can help and which it can't.
What each color usually means
Color on a raised, rough crust is probably on the surface. A tooth that is smooth and glossy but the wrong color all the way through has a problem inside.
| Color you see | Most likely cause | What to do |
|---|---|---|
| Pink or red, whole tooth, smooth | Bleeding in the pulp after a knock (pulpitis) | Vet within a few days |
| Purple or blue-gray | Pulp dying or dead | Vet within a few days |
| Gray, dark gray or dull | Dead pulp | Vet within a week or two |
| Pink or red dot on a freshly broken tip | Pulp exposed by a fracture | Vet the same day |
| Black hole in a broken or worn tooth | Exposed dead pulp | Vet within a week or two |
| Smooth, glassy brown dot on a worn, flat tip | Repair dentin under wear | Usually fine, show your vet |
| Rough yellow or brown crust at the gumline | Tartar | Vet cleaning, then home care |
| Pitted, patchy brown enamel since puppyhood | Enamel hypoplasia | Vet check, not urgent |
| Yellow or brown bands on most teeth | Tetracycline while teeth were forming | Cosmetic |
| Dark, soft pits on top of the back teeth | Cavity (caries) | Vet |
Pink, purple or gray means the pulp is hurt
Every adult tooth has a core of nerves and blood vessels called the pulp. A hard knock, from a frisbee caught at speed or a bite down on a stone, can tear those vessels without cracking the enamel. Blood seeps into the dentin, and as it breaks down the tooth turns pink, then purple, then gray. Inflamed pulp is pulpitis.
In Hale's 2001 study in the Journal of Veterinary Dentistry, vets opened 64 teeth whose whole crown had turned pink, purple, gray or tan, and 59 of them (92.2%) showed partial or complete pulp death. A 2022 study by Feigin and colleagues examined 102 stained teeth, and 85 of the 97 checked under the microscope (87.6%) were dead.
Dogs hide this pain well, and most keep eating. A dead tooth can sit quietly for months, then flare once bacteria reach the root tip and form a tooth root abscess. Swelling under the eye or beside the nose is one sign.
A tooth that has only just turned pink, especially at the tip alone, sometimes recovers if the inflammation settles, so your vet may X-ray it and recheck. A fully gray tooth almost never comes back.
Why a clear X-ray or a flashlight test doesn't settle it
A clear X-ray doesn't prove the tooth is alive. In Hale's 2001 study, 42.9% of discolored teeth showed no disease on X-ray. In Feigin's, 18.6% looked normal on X-ray, and more than half (53.9%) had no visible injury to the crown, so "he's never hurt that tooth" doesn't rule much out.
The home flashlight check has the same weakness. The idea is that a living tooth glows when light shines through it and a dead one stays dark. When Proulx and colleagues compared it with direct inspection of the pulp in 45 dogs (2022), the light test wasn't reliable enough to rule a dead tooth out.
A tooth that stays dark under a phone flashlight is worth showing your vet, but a discolored tooth that glows hasn't been cleared and needs the same visit.
What your vet does with a discolored tooth
A proper check needs a short anesthetic. The WSAVA's global dental guidelines treat dental X-rays and a full exam under anesthesia as the standard, because the answer lies at the root. Your vet looks for a dark halo at the root tip, or a canal wider than the matching tooth on the other side.
A dead or dying tooth usually gets one of two treatments. A root canal removes the pulp, seals the canal and keeps the tooth, and vets favor it for the long canine teeth and the big chewing teeth at the back. Extraction removes the whole tooth.
The 48-hour window applies to broken teeth, not to intact pink ones. A fresh fracture with a pink or red dot in the middle has its pulp open to the mouth. In Clarke's 2001 study of 97 fractured canine teeth, 88.2% were still alive three years on when treated within 48 hours of the break, against 41.4% at one week and 23.5% at three weeks. Those figures are for vital pulp therapy, which removes only the damaged top of the pulp and seals it so the tooth stays alive.
Brown near the gumline is usually tartar
Most brown on a dog's teeth is tartar, which is plaque hardened by minerals from saliva. It builds up first at the gumline, thickest on the upper back teeth, and feels rough and raised. The tooth underneath keeps its normal color.
Hardened tartar won't brush off, and scraping at home only reaches what you can see above the gumline. The AVDC's position is that scaling an awake dog is inappropriate, because tartar below the gumline can't be cleaned without anesthesia. Left in place, it keeps the gums inflamed and leads on to gingivitis and periodontitis.
Home care slows the next layer. The VOHC describes the products it accepts as helping to retard plaque and tartar, and says many older dogs still need professional scaling on top. Daily brushing comes first in the WSAVA guidelines, and if your dog won't accept a brush, Caniclean is a seaweed powder you sprinkle on food that helps reduce plaque and new tartar. It won't whiten tartar that is already hard, and it won't change a tooth stained from the inside.
Seaweed contains iodine, so ask your vet first if your dog has a thyroid condition or takes thyroid medication.
A customer left this review on our site on 27 May 2024. "My oldest dog is 15, still has all his teeth, and they're strong - but he had a lot of tartar and his breath was awful! He's not a fan of brushing, so Caniclean has been an amazing find."
Brown that's part of the tooth
Dogs that chew tennis balls, antlers or crate bars wear their teeth down, and the pulp protects itself by laying down new dentin. On the flattened tip it shows as a smooth, glassy brown dot, which is solid and usually needs no treatment. A pink or red dot, or a black hole you can see into, is different. That means the pulp is open and the tooth needs a vet. Please don't poke at it. Your vet checks with a fine probe under anesthesia, and a worn tooth should be X-rayed now and then, because some die without ever cracking open.
Enamel hypoplasia leaves thin, patchy, pitted enamel that stains brown, usually on several teeth from the time the adult teeth come in. A severe illness while those teeth were forming, distemper in particular, is one cause. Some breeds inherit it, and Gandolfi and colleagues (2013) found an inherited form in 14% of the Italian Greyhounds they tested. A vet can smooth and seal sensitive spots.
Tetracycline antibiotics given to a young puppy, or to the mother in pregnancy, bind into teeth that are still forming. It's an unlikely cause today, and the stain is cosmetic and won't scale off.
Whitening can't reach a stain that sits inside the tooth either. Our guide to dog teeth whitening explains which colors a brush or a vet polish can clear, and why peroxide whiteners made for people aren't for dogs.
Cavities are uncommon in dogs. Hale's 1998 study found them in 5.3% of 435 dogs at a dental referral practice, mostly on the big back teeth.
How fast to see a vet
- The same day for a freshly broken tooth with a pink or red dot, a swollen face, a dog that stops eating, or bleeding from the mouth.
- Within a few days for a tooth that has newly turned pink or purple.
- Within a week or two for a gray tooth with no other signs, a black hole in a worn tooth, or dark pits on the back teeth.
- At the next routine check for a smooth brown dot on a worn tooth, tartar, or marks present since puppyhood.
Questions owners ask
Can a pink tooth in a dog go back to normal?
Sometimes, if it's caught early and the inflammation settles. Pink at the tip alone has the best chance. A gray tooth is almost always dead.
Does a dead tooth hurt a dog?
Pulpitis hurts, though most dogs keep eating. Once the pulp dies, the pain can fade, then return with an abscess.
Does a discolored tooth always need to come out?
No. A root canal keeps the tooth, and a newly pink one may only need a recheck. Don't skip the follow-up, since most fully discolored teeth are dead.
Can you brush off brown stains on a dog's teeth?
Fresh plaque brushes off. Hard tartar needs a vet cleaning, and brown that is part of the tooth won't come off at all.
Is a purple tooth in a dog an emergency?
Not usually same-day, unless the tooth is broken or the face is swollen. It needs a vet within a few days, because the dog is likely in pain.
References
- Clarke DE. Vital pulp therapy for complicated crown fracture of permanent canine teeth in dogs, a three-year retrospective study. J Vet Dent. 2001;18(3), 117-121.
- Feigin K, Bell C, Shope B, Henzel S, Snyder C. Analysis and assessment of pulp vitality of 102 intrinsically stained teeth in dogs. J Vet Dent. 2022;39(1), 21-33.
- Gandolfi B, Liu H, Griffioen L, Pedersen NC. Simple recessive mutation in ENAM is associated with amelogenesis imperfecta in Italian Greyhounds. Anim Genet. 2013;44(5), 569-578.
- Hale FA. Dental caries in the dog. J Vet Dent. 1998;15(2), 79-83.
- Hale FA. Localized intrinsic staining of teeth due to pulpitis and pulp necrosis in dogs. J Vet Dent. 2001;18(1), 14-20.
- Niemiec B, Gawor J, Nemec A, et al. World Small Animal Veterinary Association Global Dental Guidelines. J Small Anim Pract. 2020;61(7), E36-E161.
- Proulx C, Dumais Y, Beauchamp G, Steagall P. Reliability of electric pulp test, cold pulp test or tooth transillumination to assess pulpal health in permanent dog teeth. J Vet Dent. 2022;39(2), 133-141.
- American Veterinary Dental College. Position statement on companion animal dental scaling without anesthesia.
- Veterinary Oral Health Council, vohc.org.