Dental Chews and Treats: Which Ones Actually Work?

Walk down the dental aisle of any pet shop and you will find dozens of products claiming to clean teeth, freshen breath, and prevent gum disease. The marketing is compelling — but the science behind many of these products is thin. Understanding which dental chews have genuine evidence and which are simply expensive treats can save you money and actually improve your pet's oral health.

"Dental chews can be a useful part of an oral care routine, but they are not a substitute for brushing. Think of them like mouthwash for humans — a helpful supplement, not a replacement for your toothbrush." — Dr. Sarah Chen, DVM

The key factor that separates effective dental chews from marketing gimmicks is mechanical action. A dental chew works by physically scraping against the tooth surface as the dog chews, which helps break up plaque before it hardens into tartar. Some products also contain active ingredients — enzymes, polyphosphates, or antimicrobial compounds — that provide additional chemical plaque control.

However, even the best dental chew only reaches the outer surfaces of the teeth where chewing occurs. It does not clean the gum line, the inner tooth surfaces, or the spaces between teeth — areas where periodontal disease typically begins. This is why regular brushing remains the gold standard for dental care, with chews serving as a valuable complement.

The Veterinary Oral Health Council (VOHC) is an independent body that evaluates dental products for pets based on controlled clinical trials. Products that earn the VOHC seal have been proven to reduce plaque and/or tartar by a meaningful amount — typically 15 to 20 per cent or more.

Why the VOHC Seal Matters

Unlike human dental products, pet dental products are not regulated for efficacy claims. Any manufacturer can claim their product "cleans teeth" or "reduces plaque" without any evidence. The VOHC seal is the only independent verification that a product actually does what it claims. You can find the full list of VOHC-accepted products on their website.

VOHC-Accepted Product Types

• Dental chews: Products like Greenies, OraVet, and Virbac C.E.T. VeggieDent have earned VOHC approval for dogs.
• Dental diets: Specially formulated kibble with larger pieces and fibrous texture that forces extended chewing — brands like Hill's t/d and Royal Canin Dental.
• Water additives: Some contain antimicrobial agents that reduce plaque-forming bacteria.
• Dental wipes and gels: Applied directly to teeth, these can supplement brushing.

For cats, fewer VOHC-accepted products exist, but Greenies Feline Dental Treats and certain dental diets have earned approval. Cats are generally less inclined to chew, making dental treats less effective for them than for dogs.

Not all chews are safe, and emergency vets regularly see dogs with broken teeth, intestinal blockages, and choking injuries from inappropriate chew products. Safety should always take priority over dental benefits.

The Thumbnail Test

Press your thumbnail into the chew. If it does not give at all, it is too hard for your dog's teeth. Products that are harder than teeth — bones, antlers, hooves, and dried cow ears — can fracture the large premolars and carnassial teeth. These fractures are painful and typically require extraction under general anaesthesia.

Size Appropriateness

Choose a chew that is large enough that your dog cannot swallow it whole. Most quality dental chews come in size ranges (small, medium, large) matched to the dog's weight. A chew that is too small is a choking hazard; one that is too large may be ignored.

Digestibility

If your dog tends to gulp rather than chew, digestibility is critical. Highly digestible chews (like Greenies) break down in the stomach even if swallowed in large pieces. Rawhide, on the other hand, is poorly digestible and can cause life-threatening intestinal obstructions if swallowed in chunks. For gulpers, consider alternatives like dental diets or water additives instead.

Calorie Content

Dental chews are food, and their calories count. A single medium Greenies chew contains about 70 calories — roughly 10 to 15 per cent of a medium dog's daily needs. Adjust meal portions accordingly to prevent weight gain. For pets on a weight loss programme, choose lower-calorie options or reduce chew frequency.

The most effective dental care combines multiple approaches. No single product can do everything, but together they provide comprehensive protection against periodontal disease.

The Ideal Daily Routine

• Daily brushing: 2 minutes with a pet-specific toothpaste and soft-bristled brush. This is the single most effective thing you can do.
• Daily dental chew: A VOHC-approved chew after a meal provides supplementary mechanical cleaning.
• Water additive: An antimicrobial water additive provides passive protection around the clock.

The Realistic Routine

If daily brushing is not feasible (and for many owners, it genuinely is not), aim for at least three times per week and compensate with a daily VOHC-approved dental chew. Even occasional brushing is significantly better than none. A dental diet as the primary food can also provide ongoing passive cleaning.

For cats, daily dental care is often more challenging. Dental gels or sprays applied to the gum line, VOHC-approved dental treats, and dental diets are practical alternatives when brushing is not tolerated. See our guide on cat dental disease prevention for feline-specific advice.

Professional Cleanings

Even with excellent home care, most pets benefit from professional dental cleanings every 1 to 3 years (depending on the individual). Professional cleaning under anaesthesia is the only way to clean below the gum line, where the most damaging bacteria accumulate. Think of home care as maintenance between professional services, not a replacement for them.

While dental chews are generally safe when used appropriately, there are situations where you should stop giving them and consult your veterinarian.

Signs of a Problem

• Broken tooth: If your dog cracks a tooth on a chew, stop all hard chews immediately and see your vet. Broken teeth expose the pulp (nerve) and are acutely painful.
• Choking or gagging: If your dog regularly chokes on chews, switch to a larger size or softer product. Supervise all chewing sessions.
• Vomiting or diarrhea: Some dogs cannot tolerate certain chew ingredients. If GI upset occurs consistently after a specific chew, discontinue it.
• Bleeding gums: While mild gum bleeding during brushing can occur in the early days, significant or persistent bleeding suggests gum disease that needs professional assessment.
• Sudden reluctance to chew: A dog that suddenly stops enjoying chews may be in dental pain. Oral tumours, abscesses, and fractured teeth can all cause sudden aversion to chewing.

Bad breath that persists despite regular dental care is another warning sign. While mild "doggy breath" is normal, a foul or metallic smell often indicates periodontal disease, infection, or occasionally a systemic illness. Your vet can determine the cause and recommend treatment. For more on recognising dental problems in pets, read our comprehensive dental care guide.