Asta-Shield is the astaxanthin antioxidant coating we apply to our brushless dental chews, designed to deliver antioxidant support to your dog's gums during everyday cleaning. It is the feature that sets our dental line apart, and in this article we explain exactly what it is, why we built it, and how it works alongside the chewing action your dog already enjoys.
For over 25 years we have made dog dental products in the USA without artificial flavors or colors. Asta-Shield grew out of a simple question: if a dog is going to chew something every day for clean teeth, could that same chew also carry a well-studied antioxidant to the gum line? That is the idea behind the name.
What Asta-Shield is made from
The active ingredient in Asta-Shield is astaxanthin, a red carotenoid antioxidant most commonly drawn from the microalga Haematococcus pluvialis. Carotenoids are the pigments that color salmon, shrimp, and many red and orange foods. Astaxanthin happens to be one of the more researched members of that family.
We coat our chews with it so the antioxidant reaches the surfaces that matter during a chew: the teeth and the surrounding gum tissue. The coating is not a flavor gimmick. It is a deliberate way to pair antioxidant support with the mechanical scrubbing a good dental chew provides.
How antioxidant support relates to gums
Gums sit at the front line of oral health. When plaque, the sticky bacterial film, gathers along the gum line, the tissue can respond with inflammation. Inflammatory activity in the body tends to come with oxidative stress, an imbalance between free radicals and the antioxidants that keep them in check.
This is where an antioxidant like astaxanthin is relevant. Laboratory research has examined how astaxanthin neutralizes free radicals and how it positions itself within cell membranes, which may help explain its activity (PubMed 10775364, PubMed 16562856). We lean on that body of work to describe Asta-Shield as a source of antioxidant support for the gums.
We want to be clear about the limits of that statement. Supporting gum health through antioxidant activity is not the same as treating gum disease. If your dog shows red, swollen, or bleeding gums, that is a conversation for your veterinarian, not something a chew is meant to fix.
The two jobs of a coated chew
Think of an Asta-Shield chew as doing two jobs at once.
The first job is mechanical. The chew's shape and texture work plaque off the teeth as your dog bites and grinds, ideally before that plaque hardens into tartar. This is the part most people picture when they think of a dental chew.
The second job is the coating. As the chew breaks down, the astaxanthin in Asta-Shield is delivered to the mouth as antioxidant support. The two jobs reinforce each other: cleaner teeth and an antioxidant present at the gum line during the same daily habit.
Asta-Shield across our chew line
We apply Asta-Shield across the range so you can choose the format that suits your dog. The chews work for dogs 12 weeks and up, and the DENTA-METER on each pack helps you match size to your dog.
Most owners start with our everyday options. Brushless Toothpaste is our classic daily chew, and Soft Brushless gives a gentler texture for dogs that prefer something softer. When you want more targeted support, Protection+ is formulated with smaller dogs in mind, and Soft Shield offers advanced protection. The full lineup lives in our shop all collection.
Building Asta-Shield into a routine
An antioxidant coating does its best work inside a consistent habit. We suggest one chew a day, matched to your dog's size, given at a predictable time so it becomes routine. Pair that with regular veterinary check-ups, which the AVMA recommends as the foundation of pet dental care.
If your dog has never had daily dental chews, ask your veterinarian whether they are appropriate, particularly for puppies, seniors, or dogs with existing health concerns. Sizing matters too: a chew that is too small for a strong chewer is a swallowing risk, so use the DENTA-METER and supervise.
Key takeaways
- Asta-Shield is our astaxanthin antioxidant coating, applied across our brushless chew line.
- Astaxanthin is a red carotenoid antioxidant from microalgae, studied for how it neutralizes free radicals.
- A coated chew does two jobs: mechanical plaque removal and antioxidant support at the gum line.
- Starter chews (Brushless Toothpaste, Soft Brushless) suit most dogs; Protection+ and Soft Shield offer more targeted care.
- Asta-Shield supports gum health and is not a disease treatment. Ask your veterinarian before starting and keep regular check-ups.
Frequently asked questions
What does Asta-Shield actually do?
Asta-Shield delivers astaxanthin, a studied antioxidant, to your dog's mouth during chewing. It provides antioxidant support for the gums while the chew's texture helps remove plaque. It supports a healthy routine rather than treating any condition.
Is Asta-Shield on every Ark Naturals chew?
We apply Asta-Shield across our brushless dental chew line, including our starter and advanced options. Check the specific product page for details, and use the DENTA-METER to pick the right size.
Can puppies have Asta-Shield chews?
Our chews are formulated for dogs 12 weeks and up. For young puppies, very small dogs, or any dog with a medical condition, confirm with your veterinarian before adding a daily chew.
Does the coating change how my dog should chew?
No. Your dog chews normally; the coating is delivered as the chew breaks down. Just match the size to your dog using the DENTA-METER and supervise, especially with enthusiastic chewers.