In this article, we’ll look at:
- Why dental disease became so widespread in modern dogs
- How chewing and saliva once kept teeth clean as a by-product of eating
- What changed with modern diets and convenience feeding
- Why brushing exists, and why it isn’t the full answer on its own
- How whole-food support like kelp works differently from dental chews and sprays
- What a nature-aligned dental system looks like in the real world
The Dental Problem We Created
By the age of 3-5, more than 80% of dogs show signs of periodontal disease(1, 2). That doesn’t just affect their teeth either. It shows up as bad breath, inflamed gums, discomfort, and over time, tooth loss and systemic inflammation.
The problem is that we tend to respond to this by treating symptoms, rather than asking why dental disease has become so widespread in the first place.
Step outside modern feeding for a moment and the contrast is rather striking. Wild and feral dogs don’t brush, rinse, or spray their teeth, yet they accumulate far less plaque and calculus, and rarely require dental intervention.
Despite this, modern dental care leans heavily on synthetic and mechanical fixes - sprays, gels, and toothbrushes - designed to manage a problem that didn’t originally exist in this form.
When dental health stopped being a by-product of species appropriate eating, brushing stepped in to fill the gap.
Why Brushing Exists At All
Brushing is undeniably effective. In controlled studies, dogs whose teeth were brushed more frequently developed significantly less plaque and calculus (hardened plaque) than those who weren’t (1). For that reason, it remains the gold standard in veterinary dentistry.
And yet, despite these recommendations, very few owners brush daily. Surveys consistently suggest that only around 7-10% do so, with the majority rarely or never brushing at al (3)l.
This isn’t because owners don’t care. Many dogs were never conditioned to tolerate tooth brushing. Some resist mouth handling entirely, and for many households, adding another daily, high-friction task simply isn’t realistic.
Brushing has been so heavily promoted because it compensates for something modern feeding removed. Chewing - in its most natural, effortful form - has largely disappeared from the way most dogs currently eat.
In other words, brushing exists as a workaround for a problem that nature had already solved long before toothbrushes entered the picture.
Nature’s original dental system: chewing
Wild dogs have long relied on tearing, gnawing, and crushing their food to maintain oral health. This form of chewing disrupts plaque, stimulates saliva production, and cleans along the gumline (4). Not as a conscious act of hygiene, but as a natural consequence of eating over thousands of years.
Bones, hide, and cartilage provide the resistance needed to keep this system working, acting as nature’s equivalent of a toothbrush.
This isn’t accidental. Dogs' anatomy is designed to eat this way.
The canine jaw functions like a hinge, moving up and down in a scissor-like action (5). Unlike humans, it can’t move side to side to grind food. Instead, it’s built for strength; gripping, ripping, and tearing at resistant materials. Their teeth reflect this design, tearing and shearing over prolonged chewing.
Chewing doesn’t just scrape the teeth; it activates the biology that keeps the oral environment stable. Canine saliva is around 99% water, which allows it to continuously flush the mouth, but its importance isn’t digestive. Instead, saliva contains bioactive compounds that help regulate bacterial populations and protect the tissues of the mouth (6).
When dogs tear and gnaw resistant materials, plaque is disrupted exactly where dental disease begins, along the gumline, while saliva repeatedly washes the mouth.
This system works because dogs are built for it, from the way their jaws move to the way their saliva functions.
The problem isn’t that this system stopped working, it’s that modern feeding stopped asking dogs to use it.
What modern food removed
Most modern dog foods require very little effort to eat, whether dry or wet. Where food once demanded tearing, gnawing, and resistance, it now comes soft, ground, or extruded.
As a result, dogs chew far less. Reduced jaw work means less abrasion, less saliva stimulation, and more residue building up along the teeth and gumline - conditions that allow dental disease to take hold (4).
Soft, highly processed diets leave residue that lingers on the teeth, and without resistance, plaque is no longer regularly disrupted (7).
Dental care stopped being a by-product of eating and shifted from behaviour to maintenance. When food no longer cleaned teeth, dental care had to be added back in manually.
Once dental care became something owners had to manage themselves, the search began for tools that could make the job easier.
The lab response: isolated fixes for systematic problem
Dental disease became more widespread, and modern dental care turned to laboratory designed solutions to manage the problem (1,4). Gels, sprays, enzyme pastes, and synthetic soft chews were developed to target plaque, bacteria, or tartar in isolation.
Look, many of these tools work, to a point. Antiseptics reduce bacterial load, enzymes can help break down plaque, and dental chews provide some mechanical abrasion.
But each of these addresses only one part of the problem. None replicate the long-term natural system where chewing, saliva, and eating behaviour worked together continuously.
If chewing keeps the mouth healthy by activating saliva, it raises an obvious question: what happens when we support saliva directly?
Where kelp fits: biology, no abrasion
Let’s just remind ourselves that not all dental support works by scraping teeth alone. While abrasion is very important, plaque formation is also shaped by the environment inside your dog's mouth.
This is where kelp enters the picture, Ascophyllum Nodosum in particular. It is a brown seaweed and whole marine plant that has been studied for its effect on oral health in dogs (and cats!). Rather than being applied to the teeth, it’s consumed as part of their diet.
Now, it’s important to understand, kelp doesn’t clean teeth mechanically - there is no abrasion. If your dogs are anything like mine, the kelp wouldn’t stay in their mouth long enough to do anything useful. Instead what kelp does is influence bacterial behavior and slow the mineralisation of plaque. In other words, it doesn’t remove what’s already there, it helps stop plaque forming as quickly in the first place. (8)
In a controlled study published in Frontiers in Veterinary Science, dogs supplemented with Ascophyllum Nodosum showed reductions in plaque, calculus, and overall oral malodour (breath) over time compared to controls. Importantly, these changes occurred without any mechanical cleaning of the teeth, i.e brushing.
As with any seaweed, appropriate dosing matters due to the iodine content, but when used correctly, kelp functions as biological support, complementing chewing rather than replacing it (9).
So, if chewing handles the physical abrasion and kelp supports biology, what does that look like when we put them together?
What a nature-aligned dental system actually looks like
In an ideal world, we prioritise both regular chewing and the thoughtful use of whole foods like kelp to support a healthy oral environment.
Regular access to chewing foods such as bones, cartilage or durable natural chews (which disrupt plaque and stimulate saliva) alongside whole-food support like kelp to help maintain a stable oral environment from the inside out, brings the system together. This combination creates a kind of biological synergy. (4,6)
In practical terms, chewing might include raw meaty bones, cartilage and skin, such as tendons or trachea. Foods that require sustained effort rather than quick consumption. As with anything, suitability depends on the individual dog, their size, chewing style and supervision.
In this context, brushing becomes far less central for many dogs, reserved instead for situations where chewing is limited, disease is already present, or individual dogs need extra support.
Of course, modern life doesn’t always allow for perfect alignment. Not every dog can chew raw meaty bones regularly, and not every owner can replicate a wild-style diet.
The goal isn’t perfect, it’s restoring as much of the original system as is practical and safe.
Why nature keeps winning
Nature has always intended to solve problems by integration rather than intervention. Dental health was never meant to rely on a single tool or daily routine, but instead built into how dogs ate, chewed and used their mouths. These behaviours have slowly faded, and modern care stepped in to compensate.
When we bring back what was removed, even partially, the need for constant intervention begins to fall away. Dental care becomes simpler, not more complicated.
References
- Journal of Veterinary Dentistry
- American Veterinary Dental College (AVDC)
- American Veterinary Medical Association (AVMA)
- Veterinary Clinics of North America: Small Animal Practice
- Textbook of Veterinary Anatomy (Dyce, Sack & Wensing)
- Journal of Veterinary Dentistry
- Journal of Animal Physiology and Nutrition
- Frontiers in Veterinary Science
- National Research Council (NRC)