Where the belief comes from
The idea that dry food is better for dental health has been accepted wisdom in veterinary circles for decades — and it wasn't entirely wrong. Studies from the 1980s and 1990s did show lower tartar accumulation in dogs fed dry food versus wet food diets. However, those early studies compared standard dry food against standard wet food without controlling for other factors — chewing behaviour, breed, saliva composition, or whether the dry food was being chewed at all. More recent, better-controlled research has produced a considerably more nuanced picture.
The chewing factor — dry food's real mechanism
The dental benefit of dry food, when it exists, comes from mechanical abrasion — the physical action of teeth contacting a hard surface. But this only happens if the dog actually chews. Multiple studies have found that a significant proportion of dogs — particularly small breeds, brachycephalic breeds, and food-motivated dogs of all sizes — swallow standard-size kibble with minimal chewing. When this happens, the mechanical cleaning benefit is essentially zero. For a dog that swallows kibble whole, dry food provides no more dental benefit than wet food in terms of mechanical cleaning. Both coat the teeth with food residue, which bacteria then metabolise to form plaque.
What wet food actually does to teeth
Wet food is undeniably more adherent — it tends to stick to tooth surfaces more readily than dry food. This does mean more immediate plaque substrate for bacteria. However, the key variable is not the food type but what happens after eating. In dogs that receive daily brushing regardless of food type, the difference between wet and dry in terms of dental health outcomes is substantially reduced. The large-scale veterinary studies that identified diet as a risk factor for periodontal disease found that the most significant dietary risk factors were:
- Feeding wet food as the primary diet without supplementary dental care
- Feeding human table scraps (high in fermentable carbohydrates)
- Ad libitum feeding (food available all day) compared to meal feeding
Dental-specific wet foods
The framing of "wet vs dry" is becoming less relevant as dental-specific formulations exist in both categories. While the VOHC-accepted dental diets are currently all dry foods, the dental benefit of these products comes from their specific formulation — polyphosphate coatings, fibre matrix texture, piece size — not simply from being dry. For dogs that genuinely cannot eat dry food — brachycephalic breeds with jaw compression, dogs recovering from dental surgery, senior dogs with few remaining teeth — wet food paired with daily brushing, dental gels, and water additives provides a viable path to good dental health. Food type is not destiny.
A practical framework
If your dog eats dry food: Check that they're actually chewing it — particularly small breeds with tiny kibble. Consider switching to a dental-formulated kibble (VOHC-accepted). Continue daily brushing — kibble does not replace it. If your dog eats wet food: Daily brushing becomes even more important to compensate for the higher plaque adhesion. Add a VOHC-accepted water additive. Use a dental gel applied to the gumline on days when brushing isn't possible. If your dog eats a mix: The middle ground is fine — just ensure your dental care routine is consistent regardless of what's in the bowl. The brushing habit is the variable that matters most.
💡 Key Takeaway
Dry food is only better for teeth if your dog actually chews it. For small breeds that swallow kibble whole, the difference narrows significantly. Daily brushing matters far more than food type. Wet food fed dogs can maintain excellent dental health with consistent brushing and dental supplements.
📚 References
- Enlund KB et al. (2020) — Dog Owners' Perspectives on Canine Dental Health. Frontiers in Veterinary Science — 80-higher risk over age 3. https://pmc.ncbi.nlm.nih.gov/articles/PMC7297050/
- Gawor JP et al. (2025) — Effectiveness of Dental Homecare Protocols in Unscaled Dogs. Journal of Veterinary Dentistry. https://journals.sagepub.com/doi/10.1177/08987564241292769
- dvm360 — The Ultimate Guide to Veterinary Dental Home Care — hard food alone does not prevent plaque or calculus accumulation. https://www.dvm360.com/view/ultimate-guide-veterinary-dental-home-care
- Stella JL et al. (2018) — A Cross-Sectional Study to Estimate Prevalence of Periodontal Disease in Dogs in Commercial Breeding Facilities — all dogs fed dry kibble, still 86.higher risk. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC5773197/
- VOHC — Accepted Products for Dogs — VOHC-accepted dental diets. https://vohc.org/accepted-products/
- Brown WY et al. (2005) — Effective Periodontal Disease Control Using Dental Hygiene Chews. Journal of Veterinary Dentistry 22(1). https://journals.sagepub.com/doi/abs/10.1177/089875640502200102
Frequently Asked Questions
Is wet food bad for dogs' teeth?
Wet food is more adherent than dry food and can increase plaque substrate, but it is not automatically bad for teeth. The key variable is what happens after eating — dogs that receive daily brushing regardless of food type show similar dental outcomes. The most important dietary risk factors for periodontal disease are not wet versus dry food, but rather ad libitum feeding (food available all day), high fermentable carbohydrate content, and absence of any dental home care.
Does dry dog food clean teeth?
Only if the dog chews it, and only with kibble specifically designed for dental cleaning. Standard kibble provides minimal dental benefit — many dogs, especially small breeds, swallow it with minimal chewing. VOHC-accepted dental diets (Hill's Science Diet Oral Care, Royal Canin Dental) are specifically formulated with texture and size to encourage cleaning action during chewing.
Can my dog have good dental health on wet food?
Yes, with consistent daily brushing and supplementary dental care. Dogs on wet food diets can maintain excellent dental health when owners compensate with daily brushing, VOHC-accepted dental gels or water additives, and regular professional cleaning. Food type is not dental destiny — the brushing habit matters far more than what is in the bowl.
Which is better for teeth — wet or dry food?
Dry food is better for teeth only when the dog actually chews it and it is formulated for dental benefit. For dogs that swallow standard kibble whole (common in small breeds), the dental advantage of dry food is negligible. For dogs on wet food with daily brushing, dental outcomes can match or exceed those on dry food without brushing. The brushing habit is the most significant variable — food type is secondary.