Partly. A good dental gel can slow the build-up of new plaque on teeth that have just been cleaned, and a few have passed the Veterinary Oral Health Council's trials for exactly that. Sprays have thinner evidence. Neither will lift off tartar that has already hardened, and neither does as much as a toothbrush.
So treat a gel or spray as a top-up. It helps most in the weeks after a vet cleaning, or for a dog that won't let a brush near its mouth. For that dog, a seaweed powder is another no-brush route, mixed into food rather than put in the mouth, and our guide to feeding seaweed to dogs safely covers which kinds are fine. If your dog's teeth already carry brown or yellow crust, that's dental calculus (tartar), and it needs scaling at your vet before any gel can do its job.
What the dog trials found
We found five controlled dog trials on PubMed that tested a gel or spray against plaque, gums or breath. They are small, and most are recent.
| Study | Product | Dogs | Teeth cleaned first? | What changed |
|---|---|---|---|---|
| Hennet, 2002 | Chlorhexidine gel, twice a day for 7 days | 22 | Yes | Less plaque than a control gel |
| Low and colleagues, 2014 | Gel with menthol and thymol, twice a day for 4 weeks | 20 | Yes | Better breath (plaque not the goal) |
| Thongma and colleagues, 2023 | Gallic acid spray, once a day for 6 weeks | 38 | Not stated | Gum and tartar scores fell within the spray group, plaque barely moved, no test against the control group |
| Gawor and colleagues, 2026 | Enzyme and liquorice gel, once a day for 30 days | 32 | Yes | 24% less plaque, 61% less gum bleeding, no change in tartar |
| Papadaki and colleagues, 2026 | Luteolin gel, once a day for 30 days | 6 | Yes | Less plaque than a placebo gel |
Four of the five started on freshly scaled teeth and measured how fast new plaque came back. That's the standard VOHC design too. None of them showed a gel or spray clearing deposits that were already there.
Only one trial compared tartar between a product group and a control group, and it is also the largest gel study. Gawor and colleagues (2026, Journal of Veterinary Dentistry) gave 16 dogs a daily gel after a cleaning and left 16 with no home care. After 30 days the gel group had about a quarter less plaque and much less bleeding along the gums, but the tartar score was the same in both groups. The maker funded the study, and three of the authors work for it.
For plaque, sprays rest on the single 2023 pilot in the table. Plaque scores barely moved in the spray dogs, and the authors never tested them against the control dogs.
What the active ingredients do
What's inside matters more than whether it comes out of a tube or a nozzle.
Chlorhexidine is the antiseptic with the longest record. Cornell University's College of Veterinary Medicine names it as one of the few ingredients with scientific backing for dental benefits in dogs. In people, its strength is that it clings to the tooth surface and keeps working after the mouth is rinsed, while other antiplaque agents act only briefly or fade sooner (Jones, 1997, Periodontology 2000). The same human research notes two catches. It can leave brown staining with long use, and some ingredients in toothpaste weaken it, so a chlorhexidine gel and a brushing session are best spaced apart unless the label says otherwise.
Enzyme gels take a different route. The chlorhexidine-free gel in the 2026 Gawor trial uses glucose oxidase to drive a peroxidase system, antibacterial chemistry that dog saliva already has, plus sugars meant to stop bacteria sticking to the tooth.
Plant extracts are the newest group, and luteolin, gallic acid and sugar cane polyphenols each have one small study. The sugar cane spray (Li and colleagues, 2026, Journal of Agricultural and Food Chemistry) lowered breath odor within two hours, a breath result rather than a plaque one.
Essential oils such as menthol and thymol are mainly about smell. The 2014 gel trial with both oils measured breath, and Cornell notes that menthol, eugenol and thymol can taste unpleasant to dogs, and a dog that fights the tube won't get its daily dose. A minty smell after a dose isn't the same as fresher breath, which is the gap we look at in whether dog breath fresheners work.
Check every label for xylitol. Cornell advises avoiding it, and in dogs it can cause a dangerous drop in blood sugar and liver damage (Murphy and Dunayer, 2018). Never use a human mouthwash, gel or spray.
How long a gel or spray stays in a licking dog's mouth
A dog doesn't rinse, but it licks and swallows all day, and every swallow carries some of the product away. Cornell explains that most sprays aren't meant to coat the teeth directly. They mix with saliva and spread around the mouth as the dog licks. That only works if the product stays put long enough.
The trials show how researchers bought that time. The 2023 spray study gave the dose at bedtime and kept food and water away for half an hour afterwards. In the 2026 gel trial, owners squeezed the gel between the lips and gums and then gently rubbed the cheeks to spread it. Both are easy to copy at home, along with two more habits from the trials.
- Put a gel between the lip and the gum along the back teeth, as owners did in the 2026 trial, then rub the cheek from outside.
- Use it after the last meal of the day, then keep food and water away for about 30 minutes, or for as long as the label says.
- Pick one time of day and stick to it. Every positive trial ran daily or twice daily.
- Expect weeks, not days. The shortest plaque result took 7 days of twice-daily use on clean teeth.
The few with a VOHC seal
The Veterinary Oral Health Council (VOHC) reviews the maker's trial data and awards a seal for a plaque claim, a tartar claim or both. Its rules ask for two trials of at least 28 days on teeth scaled and polished on day zero. Each trial has to show at least 15% less build-up than the control group, with an average of 20% across the two.
We went through the VOHC's accepted list for dogs on 6 November 2026. Of 83 products, three are gels or sprays. They are HealthyMouth Topical Gel for Dogs and HealthyMouth Topical Spray for Dogs (both accepted in 2011) and Buccaclean Gel by MP Labo (2025). All three carry a plaque claim. None carries a tartar claim.
Plenty of sprays are sold with tartar on the label, yet no stand-alone gel or spray on the VOHC list has passed a tartar test. The only gel with a tartar claim is part of a chew-and-gel pack, listed as a chew. Cornell adds that the trials behind the seal are usually paid for by the company. Read the seal as "met a set bar", not "independently proven". It's still the clearest check an owner can make in a shop.
Where a gel or spray fits
A gel or spray is most useful right after a professional cleaning, when the teeth are clean and you want to slow the return of plaque. It also works alongside brushing, and Cornell says combining the two may help, but daily brushing stays the best home care. For a dog that won't accept a brush, a fingertip of gel along the gumline is better than nothing.
If you're weighing a gel against the other no-brush routes, our comparison of dental powders, chews and water additives sorts them by the kind of dog you have.
Caniclean is our seaweed powder, sprinkled on food, and it helps reduce plaque and new tartar. It isn't VOHC-accepted and it doesn't replace brushing either. Seaweed carries iodine, so ask your vet first if your dog has a thyroid condition.
When it's a vet visit, not a spray
A gel or spray can hide a smell while a problem grows underneath. Book your vet if you see any of these.
- Red, swollen or bleeding gums, or gums that have pulled back from a tooth
- Brown or yellow crust at the gumline that doesn't wipe off
- A loose, broken or discolored tooth
- Swelling on the face or under the eye
- Pawing at the mouth, chewing on one side, dropping food or going off food
- Breath that is bad again within hours of using a product
Gingivitis means red gums along the tooth edge, and at that stage it can still settle with a cleaning and daily care. Once the bone around a tooth is lost, as in periodontitis, no gel or spray can bring it back. If your dog has a heart, kidney or thyroid condition, or takes any medication, ask your vet before starting a new oral product.
Questions owners ask
Is there a spray that removes tartar from dogs' teeth?
No spray or gel has shown that in a trial, and none on the VOHC list holds a tartar claim. Hardened tartar comes off with scaling at your vet. A gel can then help slow new plaque.
Can I use human chlorhexidine mouthwash on my dog?
Ask your vet first. Vets do use chlorhexidine in dogs, but the FDA lists mouthwash and toothpaste among the products that may contain xylitol. Use a product made for dogs at the strength your vet suggests.
Is a gel or a spray better?
In the trials so far, gels have the stronger results, and two of the three VOHC-accepted products are gels. A gel also stays where you put it. A spray is quicker for a dog that won't let you touch its mouth.
References
- Cornell University College of Veterinary Medicine, Riney Canine Health Center. Dental sprays. vet.cornell.edu.
- Gawor JP, Ziemann D, Jank M, Gard C, Navarro C, Jahier B. Effects of a new combination of antibiofilm enzymes, antiadhesive agents, and liquorice extracts on plaque accumulation in dogs. J Vet Dent. 2026;43(3), 194-200. doi:10.1177/08987564251399724
- Hennet P. Effectiveness of a dental gel to reduce plaque in beagle dogs. J Vet Dent. 2002;19(1), 11-14. doi:10.1177/089875640201900101
- Jones CG. Chlorhexidine, is it still the gold standard? Periodontol 2000. 1997;15, 55-62. doi:10.1111/j.1600-0757.1997.tb00105.x
- Li H, Fei Y, Zhao W. The control of canine halitosis by sugar cane polyphenols, effects and potential mechanisms. J Agric Food Chem. 2026;74(18), 14393-14408. doi:10.1021/acs.jafc.6c00022
- Low SB, Peak RM, Smithson CW, Perrone J, Gaddis B, Kontogiorgos E. Evaluation of a topical gel containing a novel combination of essential oils and antioxidants for reducing oral malodor in dogs. Am J Vet Res. 2014;75(7), 653-657. doi:10.2460/ajvr.75.7.653
- US Food and Drug Administration. Paws off xylitol, it's dangerous for dogs. Consumer update. fda.gov.
- 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
- Papadaki C, Lorida O, Paschalidis G, et al. Clinical evaluation of a luteolin-based dental gel on dental plaque accumulation and gingival inflammation in dogs. J Small Anim Pract. 2026. doi:10.1111/jsap.70201
- Thongma N, Sivamaruthi BS, Bharathi M, et al. Influence of gallic acid-containing mouth spray on dental health and oral microbiota of healthy dogs, a pilot study. Vet Sci. 2023;10(7), 424. doi:10.3390/vetsci10070424
- Veterinary Oral Health Council. Accepted products; trial protocol requirements. vohc.org.