Greenies dental treats are generally considered safe for most healthy adult cats when fed in moderation and according to the package directions, but they are not essential and do have some drawbacks.

Potential benefits

• Greenies for cats are designed with a crunchy texture that helps mechanically reduce some plaque and tartar as the cat chews, which can support oral hygiene and slightly improve breath.

• They are low in calories (under about 2 calories per treat) and formulated with added vitamins and minerals so they can fit into a balanced diet as an occasional reward rather than a meal.

• Veterinary sources note that most cats tolerate them well, and they can be used daily within the recommended amount as part of a broader dental-care routine.

Risks and limitations

• Greenies are high in carbohydrates compared with a cat’s natural meat‑based diet, which some feline nutrition writers and vets criticize as suboptimal, especially for overweight or diabetic cats.

• They are not a substitute for tooth‑brushing or professional cleanings; if a cat already has significant tartar, gum disease, or bad breath, treats alone will not solve the problem and a vet visit is still needed.

• As with any treat, overfeeding can contribute to weight gain, and a few cats may have digestive upset or ingredient sensitivities, so monitoring stool, vomiting, and appetite when starting them is important.

When they are “good” to use

• A generally healthy adult cat at a good body weight who eats a complete diet and receives regular vet care can usually have Greenies as a small part of total calories (commonly kept under about 10% of daily intake).

• They are most useful as a supplement to other dental measures such as brushing, VOHC‑approved products, or veterinary cleanings, not as the only form of dental care.

• Cats with known food allergies, diabetes, severe dental disease, or a history of digestive problems should have any dental treat, including Greenies, discussed with a veterinarian first.

Practical tips

• Start with a few pieces, watch for vomiting, diarrhea, or itching, and stop if any signs appear.

• Count the calories from Greenies in the daily total and reduce regular food slightly if needed to prevent weight gain.

• If the goal is maximum dental benefit, pair treats with brushing or other vet‑recommended dental products rather than relying on treats alone.