Greenies is probably the most recognised name in dental chews, with years of veterinary studies behind it. PLUTOS is a newer, smaller product built on a different base entirely. Here's how they actually compare.
What they're made from
Greenies Original starts from wheat flour and wheat gluten, bound with gelatin, with natural poultry flavour, powdered cellulose, lecithin, a synthetic vitamin and mineral premix, and fruit juice and turmeric for colour.
PLUTOS starts from milk protein, with no wheat and no synthetic colourants. It's mixed, pasteurised and air dried at our factory in Caniçal, Madeira, and the Chicken flavour comes out at 56% crude protein and 4% fat. Greenies Original declares a minimum 28% protein and 5.5–8% fat. Both are calorie-dense for their size, so factor either into your dog's daily allowance rather than feeding on top of a full meal.
How each works on teeth
Greenies relies on its chewy, ridged, toothbrush-shaped texture. The brand cites its own studies showing 47% less tartar and 40% less plaque over 28 days.
PLUTOS works the same basic way any hard chew does: the dog wears it down over a long chew, and that mechanical action helps dislodge plaque as it goes. It's a supplement to brushing, not a replacement for it, whichever chew you choose.
There's a second mechanism at work too, separate from the chewing itself. Casein — the protein PLUTOS is built on — is the same protein family used in human anti-cavity dental products, because it binds calcium and phosphate and helps remineralise enamel that's been weakened by acid, rather than just scraping it mechanically. That research comes from human dentistry, but the chemistry should carry across to dogs: enamel is the same mineral, hydroxyapatite, in both species — it's just thinner in dogs, roughly 0.1–1mm compared with 2–3mm in humans, which if anything makes the extra mineral support more useful, not less. Worth being precise about what this does: it supports enamel that's intact but mineral-depleted. It doesn't repair a chip or a crack, which is a structural problem rather than a chemical one.
Why owners compare these two
Greenies has the track record: it's one of the most studied and most widely stocked dental chews around. The trade-off some owners weigh is the wheat content, relevant if a dog is grain-sensitive, and a longer ingredient list that includes a synthetic vitamin and mineral premix and added colourants. PLUTOS is grain-free by default with a shorter ingredient list, at the cost of the brand history and study volume Greenies has built up over years.
Which one to pick
Greenies is the better fit if you want a widely available, heavily studied chew with a strong veterinary track record and aren't concerned about wheat or a longer ingredient list. PLUTOS is the better fit if you want a grain-free, single-main-ingredient chew made in Europe, without wheat gluten or synthetic colourants.
PLUTOS chews are a complementary pet food, which means a treat rather than a meal. Always supervise your dog while they're chewing, and choose a size that matches their weight.