Dental chews have the strongest evidence of the three. They scrape plaque off as your dog bites, and in one trial a chew a day did about as well as brushing every other day. Water additives slowed new plaque on freshly cleaned teeth but did little alone on teeth that hadn't been cleaned. Powders go on food, and their dental evidence is the thinnest, almost all of it paid for by makers.
Our deep dive into whether dental powders work lays out what each dog trial actually measured and why most of it used treats, not a loose powder.
Which one fits depends on the dog. A chew does little for a dog that gulps it, and a dog on a kidney or allergy diet may not be able to have chews at all. None of the three lifts tartar that has already set hard, or does the job of a toothbrush. If you're weighing a seaweed powder, our guide to whether seaweed is safe for dogs covers iodine and the kinds to avoid.
How each one works
A dental chew works mechanically. Plaque is the soft film of bacteria on the teeth, and the chew scrapes it off the crowns while your dog gnaws. That takes time, so a chew that lasts several minutes does more than one that's gone in a couple of bites.
A water additive works chemically. It goes in the drinking bowl and acts on plaque bacteria each time your dog drinks.
A powder is mixed into food, so it barely touches the teeth. For seaweed the working idea is that compounds absorbed in the gut reach the mouth in saliva, but the trial authors call the mechanism unclear, so it's a hypothesis. Our article on Ascophyllum nodosum goes through what that seaweed's trials found.
What the evidence shows for each
| Dental chew | Water additive | Powder on food | |
|---|---|---|---|
| Best dog result we found | Less plaque, tartar and gum redness than no chew after 4 weeks (Brown and McGenity, 2005) | About half the plaque of untreated dogs after 30 days, on freshly cleaned teeth (Gawor and colleagues, 2023) | Came from seaweed treats rather than a powder: the treats slowed new plaque and tartar after a cleaning (Gawor and colleagues, 2018) |
| On teeth not cleaned first | A daily chew cut deposits about as much as brushing every other day (Gawor and colleagues, 2025) | On its own, no clear change over 8 weeks (same trial) | No trial found |
| Against daily brushing | Brushing did far better in a head-to-head trial (Allan and colleagues, 2019) | No trial found | No trial found |
| VOHC-accepted dog products | 35 | 17 | 2 |
Of the 82 products on the Veterinary Oral Health Council (VOHC) list for dogs, dated August 2026, chews outnumber powders 35 to 2 (our count, October 2026). Bear in mind that a seal covers one named product that passed its trials, not a whole format.
For powders, we couldn't find a published dog trial in which a powder on food was scored for plaque or tartar. The powder studies we did find measured saliva or breath instead (Gawor and colleagues, 2021; Sordillo and colleagues, 2025), and the two powders on the VOHC list must have passed trials that we couldn't find in print. Makers paid for several of the chew and additive trials too, so look up the exact product on vohc.org.
What each one asks of you every day
| What you do each day | What goes wrong | |
|---|---|---|
| Brushing, for comparison | A minute or two with a soft brush, after weeks of getting your dog used to it | Few keep it up daily. Fewer than 4% of nearly 60,000 Swedish owners brushed daily (Enlund and colleagues, 2020) |
| Dental chew | Hand over one chew sized for your dog's weight, and stay nearby while it's eaten | Gulping, boredom with the flavor, extra calories |
| Water additive | Measure it into every fresh bowl, at the dilution on the label | Other water sources, or a dog that drinks less once it tastes different |
| Powder on food | Measure by body weight and mix into a meal | A dog that leaves its food once the powder goes on |
Brushing still gives the biggest result, so keep it up a few days a week if your dog allows it. Even owners who were taught to brush after a dental treatment tend to drift off it, as our page on keeping teeth clean after a dental cleaning explains.
Taste matters with powders too. Some dogs eat less of a meal once seaweed is mixed in at a higher strength, so watch the bowl for the first few days.
Which one suits your dog
For a dog that swallows chews whole, the choice is easy. A chew only cleans if it's chewed, and a swallowed one can get stuck in the gullet, which in the reported cases happened mostly to small dogs. Our guide to how well dental chews clean teeth has the details. For a gulper, an additive or a powder is the safer choice.
For a small dog, a chew has to be sized for its weight and eaten with you nearby, and the calorie cost is steep. One maker's dental stick uses almost the whole daily treat allowance of a 4 kg dog. A powder on food adds nothing to that allowance.
For an overweight dog, a daily chew counts toward the day's food, so take it out of the ration or use an option that isn't a treat.
Dogs with heart or kidney disease need the vet's say on all three. For dogs in heart failure, the 2019 ACVIM guidelines count sodium from treats as well as food (Keene and colleagues). A kidney diet is part of treatment, and in a randomized trial dogs with mild or moderate kidney disease had fewer crises and deaths on one than on normal food (Jacob and colleagues, 2002). A kidney patient also has to keep drinking, so stop any additive that puts your dog off its water.
During a food-allergy diet trial, skip chews. These trials run for at least 8 weeks (Olivry and colleagues, 2015, BMC Veterinary Research), and anything else your dog eats in that time can spoil the result. Beef, dairy, chicken and wheat were the most common triggers in 297 allergic dogs (Mueller and colleagues, 2016), so check the ingredient list on any chew. Ask your vet about any additive or powder before you start one.
A seaweed powder brings iodine into the bowl every day. So if your dog takes thyroid medication or has any thyroid problem, ask your vet before starting one, as you would for a heart or kidney patient.
A picky eater may refuse a chew, leave a powdered meal or drink less once an additive goes in, so watch the first week.
Using two together
The 2025 trial on uncleaned teeth found that the water additive did nothing clear for the gums by itself, but it helped when paired with a daily chew or with brushing once a week (Gawor and colleagues, Journal of Veterinary Dentistry).
Many of these trials started on teeth a vet had just scaled clean, so the week after a dental cleaning is a good time to start.
Our own powder, Caniclean, fits that kind of pairing. It is dosed by body weight and mixed into a meal, so it runs alongside a chew or a brush without adding to the treat count. It isn't VOHC-accepted, and it needs a few months before you judge it.
What none of them can do
Once plaque hardens into tartar, no chew, additive or powder will dissolve it. Gum disease is active below the gumline, in the pocket between gum and root, and a vet can only scale there with the dog under anesthesia. That's why the American Veterinary Dental College calls scaling an awake dog's teeth inappropriate, since it only cleans the visible surfaces. Early gum inflammation, gingivitis, can still settle if the teeth are cleaned and then kept clean every day. Once the bone and tissue holding the teeth have been lost, nothing you do at home brings them back.
Switching products won't help a dog whose gums bleed, whose tooth is loose, or whose teeth carry a hard crust you can't wipe away. Those need a vet rather than a new product, and our dental disease overview says how soon.
For a dog that will never take a brush, the no-brush cleaning guide puts these three and the other options in order.
Questions owners ask
Are dental powders better than dental chews for dogs?
Not on the evidence so far. Chews have more trials, including head-to-head ones, and far more VOHC seals. A powder is the better fit for a dog that gulps chews or needs to lose weight.
Do water additives work on their own?
Only after a vet cleaning, so far. On uncleaned teeth an additive alone made no clear difference over 8 weeks, but it helped the gums alongside a daily chew or weekly brushing. Also check the label for xylitol, which is dangerous for dogs.
Can I use a dental powder and dental chews together?
Yes, as long as the chew suits your dog and you count it in the day's food.
Do vets recommend dental powder for dogs?
Vets put daily brushing first, then products with a VOHC seal, and on that measure chews are far ahead, with 35 seals to 2 for powders. Use any powder alongside brushing or a chew, and check with your vet before starting one on a dog with thyroid or kidney trouble.
References
- American Veterinary Dental College. Companion animal dental scaling without anesthesia. Position statement, adopted April 10, 2004. avdc.org
- Allan RM, Adams VJ, Johnston NW. Prospective randomised blinded clinical trial assessing effectiveness of three dental plaque control methods in dogs. J Small Anim Pract. 2019;60(4), 212-217. doi:10.1111/jsap.12964
- Brown WY, McGenity P. Effective periodontal disease control using dental hygiene chews. J Vet Dent. 2005;22(1), 16-19. doi:10.1177/089875640502200102
- Enlund KB, Brunius C, Hanson J, et al. Dental home care in dogs, a questionnaire study among Swedish dog owners, veterinarians and veterinary nurses. BMC Vet Res. 2020;16, 90. doi:10.1186/s12917-020-02281-y
- Gawor J, Jank M, Jodkowska K, Klim E, Svensson UK. Effects of edible treats containing Ascophyllum nodosum on the oral health of dogs. Front Vet Sci. 2018;5, 168. doi:10.3389/fvets.2018.00168
- Gawor JP, Wilczak J, Svensson UK, Jank M. Influence of dietary supplementation with a powder containing Ascophyllum nodosum algae on dog saliva metabolome. Front Vet Sci. 2021;8, 681951. doi:10.3389/fvets.2021.681951
- Gawor JP, Ziemann D, Nicolas CS. A water additive with pomegranate can reduce dental plaque and calculus accumulation in dogs. Front Vet Sci. 2023;10, 1241197. doi:10.3389/fvets.2023.1241197
- Gawor J, Jank M, Harvey CE, Nicolas CS. Effectiveness of dental homecare protocols in unscaled dogs. J Vet Dent. 2025;42(3), 176-181. doi:10.1177/08987564241292769
- Jacob F, Polzin DJ, Osborne CA, et al. Clinical evaluation of dietary modification for treatment of spontaneous chronic renal failure in dogs. J Am Vet Med Assoc. 2002;220(8), 1163-1170. doi:10.2460/javma.2002.220.1163
- Keene BW, Atkins CE, Bonagura JD, et al. ACVIM consensus guidelines for the diagnosis and treatment of myxomatous mitral valve disease in dogs. J Vet Intern Med. 2019;33(3), 1127-1140. doi:10.1111/jvim.15488
- Mueller RS, Olivry T, Prélaud P. Critically appraised topic on adverse food reactions of companion animals (2), common food allergen sources in dogs and cats. BMC Vet Res. 2016;12, 9. doi:10.1186/s12917-016-0633-8
- Olivry T, Mueller RS, Prélaud P. Critically appraised topic on adverse food reactions of companion animals (1), duration of elimination diets. BMC Vet Res. 2015;11, 225. doi:10.1186/s12917-015-0541-3
- Sordillo A, Casella L, Turcotte R, Sheth RU. A novel postbiotic reduces canine halitosis. Animals. 2025;15(11), 1596. doi:10.3390/ani15111596
- US Food and Drug Administration. Paws off xylitol, it's dangerous for dogs. Consumer update, current as of December 17, 2025. fda.gov
- Veterinary Oral Health Council. Accepted products (dogs, August 2026) and trial protocol requirements. vohc.org