Dental Disease in Dogs: Stages, Signs and Why It Needs Anaesthesia

Dental disease is the most common thing vets find in dogs and among the least noticed by owners. The Merck Veterinary Manual puts it plainly: up to 80% of dogs have some level of periodontal disease by age 2. Not senior dogs. Two.

The reason it goes unnoticed is structural. Periodontal disease is an infection of the tissues that anchor the tooth — the bone, the ligament, the gum attachment — and almost all of that sits below the gum line where nobody can see it. What you can see, the brown tartar on the tooth surface, is the least important part.

The Five Stages

Vets grade periodontal disease by how much attachment the tooth has lost. The distinction that matters most to you is between Stage 1 and everything after it.

Stage 1 is gingivitis with no attachment loss, and it is the only stage that reverses. Once bone and ligament are gone they do not come back; treatment from Stage 2 onward is about halting progress and removing teeth that cannot be saved. That is the argument for acting on bad breath in a young dog rather than waiting for a problem you can see.

What You Can Actually Notice

The signs, roughly in the order they appear: halitosis, then plaque and hardened calculus on the teeth, inflamed and bleeding gums, gums receding away from the tooth, pocketing between tooth and gum, bone loss, exposure of the point where roots divide, teeth that move when touched, and finally teeth that are lost.

Appetite is a poor guide here and worth ignoring. Dogs continue eating through remarkable amounts of dental pain, and most owners only learn how uncomfortable their dog was from how differently it behaves a week after extractions.

Why Anaesthesia-Free Cleaning Does Not Treat This

Anaesthesia-free dental cleaning is offered widely and is genuinely appealing — no anaesthetic risk, lower cost, dog goes home the same hour. The problem is what it can reach.

Anaesthesia is what allows assessment and cleaning below the gum line, which is where periodontal disease lives. Awake cleaning improves the appearance of the tooth surface without addressing subgingival disease. A dog can leave with visibly whiter teeth and precisely the same untreated infection underneath — and the owner, reasonably, concludes the problem is handled. It is also impossible to take dental radiographs on a conscious dog, and radiographs are how bone loss is actually graded.

The Kidney Connection

Periodontal disease in dogs has been associated with an increased risk of chronic azotemic kidney disease. That association is why vets treat this as a systemic health matter rather than a cosmetic one, and it is worth knowing if your dog is older or already has borderline creatinine or BUN values. Dental disease is one of the few contributing factors on that list you can actually do something about.

Why Bloodwork Comes First

Because a dental is a general anaesthetic, your vet will want bloodwork beforehand. It checks kidney and liver function, which govern how anaesthetic drugs are processed and cleared, along with red cell count and platelets, which matter if teeth need extracting. Our guide to pre-anaesthetic bloodwork in dogs covers what each value is being checked for and what an abnormal result usually changes.

Frequently Asked Questions

Sources

• Merck Veterinary Manual — Periodontal Disease in Small Animals