No, don't use human toothpaste on your dog. People spit toothpaste out, and a dog swallows all of it. Some human pastes contain xylitol, a sweetener that can drop a dog's blood sugar dangerously, and most contain fluoride, which is a poison in large amounts. Use a toothpaste made for dogs, or plain water on a soft brush if you have nothing else.
How worried to be depends on the paste and the amount. One brushing with an ordinary fluoride toothpaste that has no xylitol is very unlikely to harm a healthy dog. A paste that lists xylitol, or a tube your dog has chewed open, is a call to your vet right away. Brushing is still the core of cleaning your dog's teeth at home, and the paste matters far less than the brushing.
Your dog swallows every brushing
Human toothpaste is designed on the assumption that you rinse and spit. A dog can't do either, so whatever is on the brush ends up in its stomach, every day you brush.
Fluoride is the active ingredient in anticavity toothpastes under US rules, and some pastes are also sweetened with xylitol. Those are the two that matter most when a dog swallows them. Most also contain a foaming detergent and strong mint flavors, which can upset a dog's stomach and put many dogs off the brush.
The label won't always help. A US toothpaste lists xylitol among its inactive ingredients, usually with no amount, so you can't tell whether there's a trace or a lot. And "natural" or fluoride-free doesn't mean safer for a dog. One fluoride-free toothpaste gel on sale in the US lists xylitol at 25% of the paste in its ingredients.
How much xylitol is too much
In dogs, xylitol sets off a large release of insulin, and signs of low blood sugar can start within 30 minutes of eating it. The Merck Veterinary Manual, in a chapter written by a vet at the ASPCA Animal Poison Control Center, links doses above about 100 mg per kg of body weight with low blood sugar, and doses above 500 mg per kg with severe liver damage. Signs of low blood sugar include vomiting, weakness, wobbling, lethargy, seizures and coma. Liver signs can take 24 to 48 hours to show.
We worked out what those doses mean for a paste that is 25% xylitol, like the one above.
| Dog | Paste that reaches the low blood sugar line | Paste that reaches the liver damage line |
|---|---|---|
| 10 lb (4.5 kg) | about 1.8 g | about 9 g |
| 30 lb (13.6 kg) | about 5.4 g | about 27 g |
| 60 lb (27.2 kg) | about 11 g | about 54 g |
For a 10-lb dog, that first line is about 1% of a 6-oz tube. Many pastes contain less xylitol than this one or none at all, but a label that gives the percentage is unusual, so treat any paste that lists xylitol as dangerous for a small dog.
How much fluoride is too much
Fluoride works differently. US rules set most fluoride toothpastes at 850 to 1,150 parts per million (one type may reach 1,500), roughly 1 mg of fluoride in every gram of paste, and cap a tube at 276 mg in total.
Veterinary texts have long given 5 to 10 mg of fluoride per kg of body weight as a dose that can kill. The 2026 review in the Merck Veterinary Manual says that figure probably sits on the low side, so we use 5 mg per kg as a cautious line. At about 1,100 parts per million, a 10-lb dog would need to swallow around 21 g of paste to reach it, a 30-lb dog around 62 g and a 60-lb dog around 124 g, which is most of a 6-oz tube. Signs of acute fluoride poisoning usually start within 2 hours, with vomiting, drooling, restlessness and weakness, and in bad cases a racing heartbeat and seizures. There is no specific antidote, and treatment is largely supportive.
Fluoride becomes a real problem when a dog eats a tube, not when you brush. A 6-oz tube at that strength holds about 187 mg of fluoride, enough to pass the 5 mg per kg line for any dog under about 82 lb.
What dog toothpaste does, and what the brush does
Dog toothpaste is made to be swallowed. It shouldn't contain fluoride or xylitol (check the label anyway), it doesn't foam, and it comes in flavors such as poultry or malt that most dogs like. The flavor is its main job, because a dog that likes the taste accepts the brush.
The cleaning comes from the bristles. In a 1976 study, four dogs with gingivitis had their teeth brushed with a fluoride paste, a fluoride-free paste or plain saline, and the gums improved whichever was on the brush (Brayer and colleagues, Journal of Dental Research). In a 2016 study on 12 beagles after a cleaning, daily brushing on its own kept mouth bacteria lower than putting 2 g of an enzymatic dog toothpaste on the teeth every day without brushing (Watanabe and colleagues, Journal of Veterinary Medical Science). The paste alone helped a little, at weeks 5 to 7, and one of the authors worked for its maker. Both studies are small. In a larger trial on 160 racing greyhounds, daily brushing reduced gingivitis and both weekly and daily brushing cut tartar over two months (Rooney and colleagues, 2021, Animals).
Enzymatic pastes add enzymes meant to boost an antibacterial system already in saliva. The 2016 beagle study is the only controlled dog trial of one that we found when we searched Europe PMC on November 1, 2026. When we read the Veterinary Oral Health Council's list of accepted dog products on November 1, 2026, three toothpastes were on it, plus two kits that pair a paste with a dental stick or a brush, so most pastes on the shelf haven't been through that testing. Any dog toothpaste your dog enjoys is a reasonable choice.
A homemade toothpaste works as well if you keep it to a dab of plain coconut oil or unsalted homemade broth and leave out the baking soda, bouillon cubes and essential oils that many recipes add.
For the technique and a two-week plan to get a reluctant dog used to it, see our guide to brushing your dog's teeth step by step.
What to brush with if you have no dog toothpaste
Use a soft toothbrush dipped in water. In both studies above, brushing with no toothpaste still worked, and you can add a dog toothpaste once you have one.
Skip the kitchen cupboard. Baking soda is not safe for cleaning dog teeth, because a quarter teaspoon holds more sodium than a 33-lb dog needs in a day. Homemade toothpaste recipes often use it too, and some sweeten the mix with peanut butter, so check any peanut butter for xylitol.
If your dog won't accept a brush at all, our page on cleaning dog teeth without brushing ranks the options, and a seaweed powder is one of them. Caniclean is ours. You sprinkle it on your dog's food, and it helps reduce plaque and new tartar, but it won't remove tartar that has already hardened. Seaweed contains iodine, so ask your vet first if your dog has a thyroid condition.
If your dog ate toothpaste
Find the tube and read the ingredients for xylitol and fluoride. Work out roughly how much is gone, and note your dog's weight and the time. Then call your vet, an emergency vet, or a pet poison line, even if your dog seems fine. Signs of low blood sugar from xylitol can start within 30 minutes, or up to 12 to 18 hours later with slow-release products such as some gums.
- ASPCA Animal Poison Control Center, (888) 426-4435, open 24 hours (a fee may apply)
- Pet Poison Helpline, (855) 764-7661, open 24 hours (a fee applies)
Don't make your dog vomit at home unless a vet tells you to. Merck advises that vomiting should ideally be induced only under veterinary supervision, and only while the dog still seems normal. If your dog is weak, wobbly, vomiting or having a seizure, go straight to the nearest vet. A dog with uncomplicated low blood sugar usually does well when it is treated quickly. Once the liver is involved the outlook is far more guarded.
Questions owners ask
Can I use kids' toothpaste on my dog?
No. Children's toothpastes are made to be spat out too, and many contain fluoride. Check any label for xylitol.
Is a human toothpaste with no fluoride and no xylitol safe?
It avoids the two hazards covered here, but it is still made to be spat out. The foaming agents and strong flavors can upset a dog's stomach, and a dog that dislikes the taste resists the brush. A dog toothpaste is the better choice.
I brushed my dog's teeth with my toothpaste once. What now?
Check the label. If it has no xylitol, a single brushing with an ordinary fluoride paste is far below the fluoride amounts in this article, even for a small dog, so switch to dog toothpaste and watch for an upset stomach. If it lists xylitol, call your vet or a poison line now, especially for a small dog.
Do I need an enzymatic toothpaste?
No. There is little trial evidence that the enzymes add much, and brushing does the work. Choose a dog toothpaste your dog enjoys and brush daily if you can.
References
- Brayer L, Rennert H, Gedalia I. Effect of brushing the teeth with a fluoride-containing and fluoride-free dentifrice on the gingiva of dogs. J Dent Res. 1976;55(5), 825-828. doi:10.1177/00220345760550051801
- Dunayer EK, Gwaltney-Brant SM. Acute hepatic failure and coagulopathy associated with xylitol ingestion in eight dogs. J Am Vet Med Assoc. 2006;229(7), 1113-1117. doi:10.2460/javma.229.7.1113
- Murphy LA, Dunayer EK. Xylitol toxicosis in dogs, an update. Vet Clin North Am Small Anim Pract. 2018;48(6), 985-990. doi:10.1016/j.cvsm.2018.06.004
- Piscitelli CM, Dunayer EK, Aumann M. Xylitol toxicity in dogs. Compend Contin Educ Vet. 2010;32(2), E1-4.
- Rooney NJ, Wonham KL, McIndoe KS, Casey RA, Blackwell EJ, Browne WJ. Weekly and daily tooth brushing by care staff reduces gingivitis and calculus in racing greyhounds. Animals (Basel). 2021;11(7), 1869. doi:10.3390/ani11071869
- Watanabe K, Kijima S, Nonaka C, Matsukawa Y, Yamazoe K. Inhibitory effect for proliferation of oral bacteria in dogs by tooth brushing and application of toothpaste. J Vet Med Sci. 2016;78(7), 1205-1208. doi:10.1292/jvms.15-0277
- Merck Veterinary Manual. Xylitol toxicosis in dogs (updated June 2025). https://www.merckvetmanual.com/toxicology/food-hazards/xylitol-toxicosis-in-dogs
- Merck Veterinary Manual. Fluoride poisoning in animals (reviewed March 2026). https://www.merckvetmanual.com/toxicology/fluoride-poisoning/fluoride-poisoning-in-animals
- US Code of Federal Regulations, 21 CFR 355.10 and 355.20, anticaries drug products for over-the-counter human use. https://www.law.cornell.edu/cfr/text/21/355.10
- Veterinary Oral Health Council. Accepted products for dogs (read November 1, 2026). https://vohc.org/accepted-products/
- ASPCA Animal Poison Control Center. https://www.aspca.org/pet-care/animal-poison-control
- Pet Poison Helpline. https://www.petpoisonhelpline.com/