Navigating a Market Full of Claims
Walk down the pet care aisle of any supermarket or pet shop and you will find dozens of products promising to clean your dog's teeth, freshen their breath, and prevent dental disease. The packaging is confident. The claims are sweeping. The price points vary wildly. And behind all of it lies a fairly uncomfortable truth: the vast majority of products marketed as dental treats or dental chews have never been independently tested to demonstrate that they actually work.
This is where the Veterinary Oral Health Council — and its seal of acceptance — becomes genuinely important for any dog owner trying to make an informed choice.
What Is the VOHC?
The Veterinary Oral Health Council is an independent organisation comprising board-certified veterinary dental specialists. Its purpose is to evaluate the evidence behind oral health products for companion animals and grant a seal of acceptance to those that meet specific scientific standards for efficacy.
Products apply voluntarily for the VOHC seal. To receive it, a manufacturer must submit data from controlled clinical trials demonstrating that the product meaningfully reduces either plaque or tartar accumulation — or both — in dogs or cats. The threshold is a statistically significant reduction of at least 10% compared to a control group. This is a modest bar, but it is a scientifically meaningful one that most products simply cannot meet.
The seal comes in two versions: one for plaque control and one for tartar control. These are not the same thing, and the distinction matters. Plaque is the soft bacterial film that forms on teeth continuously. Tartar is the hardened mineralised form of plaque. Controlling plaque before it mineralises is preventative; addressing tartar requires either mechanical removal (brushing, professional cleaning) or products that inhibit the mineralisation process.
How Dental Chews Actually Work
Effective dental chews operate through one or more mechanisms.
- Mechanical abrasion: The chewing action scrubs the tooth surface, removing plaque in a similar way to brushing. The texture and density of the chew determines how effectively this occurs.
- Chemical inhibition: Some chews incorporate ingredients such as sodium hexametaphosphate, which binds calcium in saliva and reduces the rate at which plaque mineralises into tartar.
- Antimicrobial agents: Ingredients such as zinc gluconate or green tea extract can inhibit bacterial growth in the mouth, reducing overall plaque load.
Chews that work primarily through mechanical action must be the right texture. They need to be firm enough to require sustained chewing without being so hard that they risk cracking teeth. A general rule used by veterinary dentists is the thumbnail test: if you press your thumbnail into the chew and it does not leave an indentation, the product is too hard and poses a fracture risk. This includes antlers, certain nylon bones, cooked bones, and very hard rawhide products — none of which carry the VOHC seal, and all of which are associated with tooth fractures in practice.
VOHC-Accepted Products Worth Knowing
The full, updated list of VOHC-accepted products is published on the council's website, and it is worth checking directly since the list changes as new products gain acceptance and others lose it. That said, several product categories and brands have consistently held VOHC acceptance for dogs.
- Greenies Original Dental Treats: One of the most widely available and well-known VOHC-accepted chews. They have demonstrated efficacy for both plaque and tartar reduction. Available in multiple sizes for different breeds.
- Virbac C.E.T. Enzymatic Chews: These incorporate an enzymatic system — glucose oxidase and lactoperoxidase — that produces antimicrobial compounds in the mouth. VOHC-accepted for plaque reduction.
- OraVet Dental Hygiene Chews: These use a proprietary delmopinol formulation that creates a barrier on the tooth surface to reduce bacterial adhesion. VOHC-accepted for plaque and tartar control.
- Hill's Prescription Diet t/d: A dental diet rather than a chew, but worth mentioning. The kibble is designed with a specific fibre matrix and large piece size that encourages chewing contact along the whole tooth surface. VOHC-accepted.
What the Seal Does Not Tell You
The VOHC seal confirms that a product has demonstrated efficacy in clinical trials, but it does not account for individual dog suitability. A chew that is appropriate for a healthy adult Labrador may be entirely inappropriate for a Yorkshire Terrier with existing dental disease, a puppy with developing teeth, or a senior dog with compromised kidney function (relevant for products containing certain additives).
The seal also does not tell you how a chew ranks against other accepted products. All accepted products have met the minimum efficacy threshold; the seal does not indicate which is most effective. Other factors — your dog's size, chewing style, any food sensitivities, and your own budget — must inform your final choice.
Calorie content is another consideration that the seal does not address. Several popular dental chews are surprisingly calorie-dense, and owners who add them to an already complete diet without adjusting other food intake can inadvertently contribute to weight gain. Always check the feeding guidelines and account for the treat's calories within your dog's daily total.
Where Chews Fit in the Bigger Picture
It would be misleading to present VOHC-accepted dental chews as an equivalent to daily tooth brushing. The evidence consistently shows that brushing remains the most effective home care method. However, dental chews represent a meaningful and evidence-based addition to an oral health routine — and for dogs who will not accept a toothbrush regardless of training efforts, they may be the most practical option available.
Veterinary guidance generally supports a layered approach: brush when possible, supplement with a VOHC-accepted chew, consider a VOHC-accepted water additive for additional benefit, and maintain regular professional dental examinations so that any disease developing below the gumline does not go undetected.
For dogs at higher risk of dental disease — small breeds, brachycephalic breeds, senior dogs — a conversation with your veterinary surgeon about the most appropriate combination of home care products is time well spent. The VOHC seal gives you confidence that the products you are considering have the science to back up their claims; your vet can help you build those products into a routine that actually works for your individual dog.