Last updated October 20, 2026
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.
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 removes tartar that has already hardened, and none replaces brushing. 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. Chewing time seems to matter. In a 2022 study run by the chews' maker, a porous chew that took about 12 minutes to eat lowered breath gases, while the small drop after a hard one, finished in about 3 minutes, could have been chance (Croft and colleagues, BMC Veterinary Research).
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) | Seaweed dental bites, not powder, gave 38% less plaque and 20% less tartar than placebo at 90 days (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 controlled plaque more than three times as well (Allan and colleagues, 2019) | No trial found | No trial found |
| VOHC-accepted dog products | 35 | 17 | 2 |
The Veterinary Oral Health Council (VOHC) awards the dental seal. We counted its list for dogs, dated August 2026, on October 19, 2026. Of 82 accepted products, 35 are edible chews, 17 are water additives and 2 are powders added to food. Each seal belongs to one named product that passed two trials on teeth scaled clean, not to the whole format.
We searched Europe PMC on October 20, 2026 and couldn't find a published dog trial of a powder on food that scored plaque or tartar. The powder studies we did find measured saliva chemistry (Gawor and colleagues, 2021) or breath. In the breath trial of 24 dogs, the half given a postbiotic powder had breath gases 27% lower than the placebo half over 14 days, and every author worked for the maker (Sordillo and colleagues, 2025, Animals). The two powders on the VOHC list must have passed trials, but we couldn't find them 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 shown how after a dental treatment drift off it, and in one survey 38% had stopped altogether six months or more later (Miller and Harvey, 1994).
Taste matters with powders. Offered kibble with 1% seaweed beside plain kibble, 11 dogs ate only about a third as much of the seaweed food in the first five minutes, and at 0.3% they showed no preference (Isidori and colleagues, 2019).
Which one suits your dog
A dog that swallows chews whole is the clearest case. A chew only cleans if it's chewed, and a swallowed one can lodge in the gullet. In a case series from 19 veterinary hospitals, 31 dogs had a dental chew stuck in the esophagus, 26 of them small dogs. Six needed chest surgery, and about a quarter didn't survive (Leib and Sartor, 2008, Journal of the American Veterinary Medical Association). Those cases date from 2000 to 2006, and products have changed since. For a gulper, an additive or a powder is the safer choice.
Small dogs are more prone to gum disease. Among 22,333 dogs in UK practices, Toy Poodles had nearly four times the odds of a periodontal disease diagnosis of crossbreds, and the odds fell as body weight rose (O'Neill and colleagues, 2021). A chew sized for the dog and eaten with you nearby can still work. The seaweed bite trial used only small dogs, averaging about 4 kg.
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.
Brown seaweeds can hold 2,500 to 10,000 micrograms of iodine per gram dried (Smyth, 2021, European Thyroid Journal). If your dog has a thyroid condition or takes thyroid medication, talk to your vet before any seaweed powder.
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
In the 2025 trial on teeth that hadn't been cleaned first, the water additive alone made no clear difference to the gums, but it did 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.
Caniclean is our seaweed powder. You sprinkle it on your dog's food, with the amount for each body weight printed on the pack, and it helps reduce plaque and new tartar. It isn't VOHC-accepted, and it works alongside a brush or a chew rather than replacing them. Give it a few months before you judge it. Erin McFadden wrote in a verified review on July 29, 2024, "I've been using it for 4 months now and their teeth are looking much better."
What none of them can do
Tartar is plaque that has hardened with minerals from saliva, and no chew, additive or powder dissolves 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. Gingivitis means red gums along the tooth edge, and at that stage it can still settle with a cleaning and daily care. Periodontitis is the loss of bone and tissue holding the teeth, and home care can't reverse it.
See your vet rather than switching products if you notice
- red, swollen or bleeding gums
- a loose or broken tooth
- swelling on the face or under the eye
- brown or yellow crust at the gumline that doesn't wipe off
- pawing at the mouth, chewing on one side, or going off food
If your dog won't accept a brush at all, our guide to cleaning dog teeth without brushing sets out a routine around these options.
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?
The AAHA and WSAVA dental guidelines put daily brushing first, then products with the VOHC seal, and two food powders carry that seal for dogs. Use any powder alongside brushing or a chew, and ask your vet first if your dog has a thyroid or kidney condition.
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
- Bellows J, Berg ML, Dennis S, et al. 2019 AAHA dental care guidelines for dogs and cats. J Am Anim Hosp Assoc. 2019;55(2), 49-69. doi:10.5326/JAAHA-MS-6933
- Brown WY, McGenity P. Effective periodontal disease control using dental hygiene chews. J Vet Dent. 2005;22(1), 16-19. doi:10.1177/089875640502200102
- Croft JM, Patel KV, Inui T, Ruparell A, Staunton R, Holcombe LJ. Effectiveness of oral care interventions on malodour in dogs. BMC Vet Res. 2022;18, 164. doi:10.1186/s12917-022-03267-8
- 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
- Isidori M, Rueca F, Trabalza-Marinucci M. Palatability of extruded dog diets supplemented with Ascophyllum nodosum. J Appl Phycol. 2019;31, 3275-3281. doi:10.1007/s10811-019-01799-5
- 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
- Leib MS, Sartor LL. Esophageal foreign body obstruction caused by a dental chew treat in 31 dogs (2000-2006). J Am Vet Med Assoc. 2008;232(7), 1021-1025. doi:10.2460/javma.232.7.1021
- Miller BR, Harvey CE. Compliance with oral hygiene recommendations following periodontal treatment in client-owned dogs. J Vet Dent. 1994;11(1), 18-19. doi:10.1177/089875649401100103
- 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
- Niemiec B, et al. WSAVA global dental guidelines. J Small Anim Pract. 2026;67(10). doi:10.1111/jsap.70057
- 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
- O'Neill DG, Mitchell CE, Humphrey J, Church DB, Brodbelt DC, Pegram C. Epidemiology of periodontal disease in dogs in the UK primary-care veterinary setting. J Small Anim Pract. 2021;62(12), 1051-1061. doi:10.1111/jsap.13405
- Smyth PPA. Iodine, seaweed, and the thyroid. Eur Thyroid J. 2021;10(2), 101-108. doi:10.1159/000512971
- 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