Short answer: Pet oral-care products draw on a handful of ingredient families: gentle cleaners such as silica and sodium bicarbonate, calcium binders such as sodium hexametaphosphate that help keep tartar from building up, enzyme systems, seaweed (kelp), zinc compounds that help neutralise breath odours, and flavourings. Some ingredients have no place in a pet's mouth: xylitol is toxic to dogs, and essential oils and phenols are unsafe for cats. Chlorhexidine at medicinal levels belongs in authorised veterinary medicines. Our Odovyx™ platform chooses ingredients by species, format and evidence, and we never publish formulations.
How to read this page
This is education about ingredient categories, not a list of our formulations: we do not publish recipes or percentages. Three principles apply throughout.
- An ingredient's evidence is not a product's evidence. How much reaches the teeth, in what format and for how long decides what a product does. A finished product needs its own evidence.
- Species first. An ingredient that suits a dog can be unsuitable for a cat, and neither tells you anything about a horse.
- Grade matters. One chemical name can describe a food-grade material or an industrial one. Only food, feed or oral-care grades belong in a pet's mouth.
Gentle cleaners: silica and sodium bicarbonate
Mild abrasives help a toothbrush lift soft plaque and surface staining. Hydrated silica and sodium bicarbonate (baking soda) are the most familiar; sodium bicarbonate also adjusts a paste's acidity.
The catch is enamel. A dog's or cat's enamel is roughly 0.1 to 0.6 mm thick, against about 2 to 2.5 mm in people, so abrasiveness has to stay low. Responsible manufacturers use low-abrasion, oral-care-grade silica and test the finished paste, not just the raw material. In powders, a little precipitated silica may appear for a different reason entirely: it keeps the powder flowing.
The brush does most of the work; a toothpaste helps, and tastes good enough that your pet accepts the next clean.
Calcium binders: sodium hexametaphosphate and other polyphosphates
Tartar forms when calcium phosphate from saliva settles into plaque and hardens it. Polyphosphates such as sodium hexametaphosphate (SHMP) bind calcium in saliva, leaving less of it available to harden plaque. In the words we use for products, they help keep tartar from building up.
Controlled studies in dogs have tested polyphosphates, including SHMP and sodium tripolyphosphate, as coatings on food, and found that getting the ingredient onto the tooth surface was important B in dogs, at ingredient level. We have not yet graded studies in cats. A product that contains SHMP still needs its own evidence before it can claim a result.
Purity matters here. Our development standard allows only high-purity food- or feed-grade polyphosphates, checked for identity, purity and contaminants, and excludes technical grades made for industry.
Enzyme systems
Some pet toothpastes and gels include enzyme systems modelled on saliva's own chemistry, such as glucose oxidase paired with lactoperoxidase. They are used to support normal oral hygiene alongside brushing; we have not yet graded pet studies of them.
Enzymes are delicate: heat can inactivate them, so they are added late in manufacture at controlled temperatures. We are more cautious with protein-digesting enzymes such as papain at high strength, which our development standard excludes from routine daily products because the case for long-term daily use at those levels has not been made.
Petsmile® Professional Pet Toothpaste, which we distribute, takes a different route, using Calprox® (an encapsulated calcium peroxide). Its VOHC acceptance, for plaque in dogs, belongs to that exact product.
Seaweed: Ascophyllum nodosum (kelp)
Ascophyllum nodosum, a brown seaweed often sold as Nordic kelp, is one of the most familiar ingredients in dental powders served over food. Published companion-animal research on kelp-based powders exists; results belong to the product and amount tested, and we will show our grade once Biodontic™ has completed its review. Two cautions matter more than any claim.
- Iodine. Kelp is naturally rich in iodine. Thyroid conditions are common in older cats, so cat products should avoid high-iodine kelp, and any pet with a thyroid condition, or on thyroid medication, should see their vet before starting a kelp product.
- Purity. Seaweed concentrates minerals from the sea, so kelp products should be tested for iodine and for heavy metals such as arsenic, lead, cadmium and mercury.
Introduce any powder gradually, starting with about a quarter serving, so digestion can adjust.
Zinc compounds
Zinc salts, such as zinc gluconate, citrate or ascorbate, appear in water additives, gels, sprays and powders. Their job is breath: zinc binds the volatile sulphur compounds behind much breath odour, which is why it helps neutralise breath odours.
Zinc is also a nutrient with legal limits, so the amount matters. Responsible formulation calculates the total zinc in each serving and allows for the zinc already in the diet, which is why our development standard keeps zinc low. A sudden change in your pet's breath is a reason to see your vet, not to reach for a stronger freshener.
Chlorhexidine: where hygiene ends and medicine begins
Chlorhexidine is an antiseptic long used in human and veterinary dentistry, and it is where the line between a hygiene product and a medicine becomes visible.
The UK Veterinary Medicines Directorate's guidance lists chlorhexidine among the ingredients that make a product “medicinal by function” above certain concentrations. A product using it at those levels is a veterinary medicine and needs a marketing authorisation before it can be sold. If your vet supplies or recommends one, follow their instructions.
Our position is simple. Petdentist® products are non-medicinal oral-hygiene products and complementary feeds, and we never present them as medicines. Our development standard for routine daily products excludes chlorhexidine.
Unsafe ingredients, and what we avoid
Two groups of ingredients have no place in a pet's mouth, whatever the label says.
- Xylitol: never. Also sold as birch sugar, it is toxic to dogs and can cause a dangerous fall in blood sugar and liver damage. Check sugar-free gum, sweets, foods made for people and human toothpaste. No Petdentist® product contains it. If your dog eats xylitol, contact your vet immediately.
- Essential oils and phenols: not for cats. Cats process them poorly because a key liver pathway, glucuronidation, works poorly in cats, and these oils can also irritate the delicate lining of the mouth. Tea tree, clove, peppermint and eucalyptus oils and menthol are common examples.
| What we leave out | Why |
|---|---|
| Xylitol | Toxic to dogs; excluded from every product |
| Essential oils and phenols | Unsafe for cats; excluded from any product intended for cats, and tea tree, clove and peppermint oils from all new daily products |
| High-iodine kelp in cat products | Thyroid conditions are common in older cats |
| Onion and garlic | Unsafe for dogs and cats |
| Fluoride and foaming agents made for human toothpaste | Pets swallow toothpaste; human pastes are made to be spat out |
| Alcohol in routine oral products | Unnecessary in products that pets swallow |
| Chlorhexidine in routine daily products | A medicinal-type active at medicinal levels |
| High-strength protein-digesting enzymes | The case for long-term daily use has not been made |
| Probiotic blends not identified to strain level | Evidence belongs to strains; an unnamed blend cannot be checked |
| Technical-grade raw materials and harsh abrasives | Only food, feed or oral-care grades belong in a pet's mouth, and pet enamel is thin |
Flavourings and palatability
Pet toothpastes taste of chicken, beef or cheese for a reason: a product your pet refuses is a product that never gets used. Flavour systems range from yeast extracts to poultry, fish or liver hydrolysates; Petsmile® Professional Pet Toothpaste, for example, comes in London Broil, Rotisserie Chicken and Say Cheese.
If your pet has a known food sensitivity or eats a veterinary diet, check the flavour source on the label and ask your vet. Flavour should never come from sweeteners made for people. For new products, our development standard includes a small acceptance and tolerance check in healthy animals before launch: a check on acceptance, not an efficacy trial.
How Odovyx™ selects ingredients
Odovyx™ is our ingredient technology platform. Every candidate ingredient must pass the same questions.
- Is it safe for this species? Dogs, cats and horses are assessed separately, with species-specific safety data. Nothing is assumed from one species for another.
- Does it have a clear job? Cleaning, calcium binding, breath, flavour, texture or stability. Decorative extracts are left out.
- Does the evidence support that job, in this species? Evidence-supported chemistry comes before fashionable ingredient lists.
- Does it suit the format? Powders, chews, toothpastes, gels, water additives and wipes reach the mouth differently, so each format is formulated on its own terms.
- Is it fully documented? Identity, supplier, specification, certificate of analysis, contaminant limits and regulatory status in every market we sell in.
- Is the amount conservative? Daily amounts are calculated and kept within safety margins, allowing for the rest of the diet.
- Does the finished product pass? Stability, microbiological quality, palatability and tolerance in healthy animals, then a final review of every word on the label.
Odovyx™ makes no efficacy claims for ingredients, and we do not publish formulations. What a product may say depends on the evidence for that product: see our evidence standards.
When to see your vet
If you notice loose or wobbly teeth, swelling, discharge, bleeding that does not settle, reluctance to eat, dropping food, drooling, pawing at the mouth or any change in behaviour, please contact your veterinary surgeon promptly. Home care supports professional care — it never replaces it.
How we grade evidence
Every scientific statement on this site carries a grade: A product-specific controlled trial · B strain- or species-specific study in dogs or cats · C species mechanistic evidence · D laboratory (in-vitro) evidence · E theoretical rationale. The strength of a claim never exceeds the strength of its evidence. Read our evidence standards.